# 井

| 井 | U+4E95, &#20117; CJK UNIFIED IDEOGRAPH-4E95 |
| ← 五 [U+4E94] | CJK Unified Ideographs | 亖 → [U+4E96] |

## Translingual
### Han character

井 (Kangxi radical 7, 二+2, 4 strokes, cangjie input 廿廿 (TT), four-corner 5500$_0$, composition ⿻一廾)

#### Derived characters

* 㘫, 妌, 𪪁, 汫, 阱, 𪰉, 肼, 㐩, 𭾠, 畊, 𮈃, 𬙍, 耕, 䎴, 𬟷, 𮗻, 𬪦, 㓝, 刱, 𫡳, 𫎁, 宑, 𬜣, 𬼾, 𭾞, 穽, 𬆓, 䨍, 坓, 汬, 丼, 𬑽, 囲
* 𰃖, 进, 讲 (Simplified from 進 and 講)

#### Descendants

* ヰ (Katakana character derived from Man'yōgana)

#### References

* Kangxi Dictionary: page 86, character 14
* Dai Kanwa Jiten: character 258
* Dae Jaweon: page 183, character 1
* Hanyu Da Zidian (first edition): volume 1, page 10, character 4
* Unihan data for U+4E95

## Chinese
### Glyph origin

Historical forms of the character 井 :
| Shang | Western Zhou | Warring States | Shuowen Jiezi (compiled in Han) | Liushutong (compiled in Ming) |
| Oracle bone script | Bronze inscriptions | Chu slip and silk script | Small seal script | Transcribed ancient scripts |
| Oracle bone scriptj12550j12551j12552j12553j12554j12555j12556j12557j12558j12559j12560j12561j12562j12563j12564j12565j12566j12567j12568j12569j12570j12571j12572j12573j12574j12575Bronze inscriptionsb07748b07749b07750b07751b07752b07753b07754b07755b07757b07758b07759b07760b07761b07762b07763b07764b07765b07766b07767b07768b07769b07770b07771b07772b07773b07774b07775b07776b07777b07778b07779b07780Small seal scripts03663Transcribed ancient scriptsL17889L17890L17891L17892 |||||
| References: Mostly from Richard Sears' Chinese Etymology site (authorisation), which in turn draws data from various collections of ancient forms of Chinese characters, including: Shuowen Jiezi (small seal), Jinwen Bian (bronze inscriptions), Liushutong (Liushutong characters) and Yinxu Jiaguwen Bian (oracle bone script). |||||
| | Old Chinese |
| 硎 | *kʰreːŋ, *ɡeːŋ |
| 耕 | *kreːŋ |
| 荊 | *keŋ |
| 井 | *skeŋʔ |
| 丼 | *kl'oːmʔ, *skeŋʔ |
| 妌 | *sɡeŋʔ |
| 穽 | *sɡeŋʔ, *sɡeŋs |
| 阱 | *sɡeŋʔ, *sɡeŋs |
| 汫 | *sɡeːŋʔ |
| 刑 | *ɡeːŋ |
| 形 | *ɡeːŋ |
| 邢 | *ɡeːŋ |
| 鉶 | *ɡeːŋ |
| 型 | *ɡeːŋ |
| 侀 | *ɡeːŋ |
Pictogram (象形) – a square well, with supports on four sides.
Some forms have a stone inside the well, as in 丼.

### Etymology 1
#### Pronunciation

* Mandarin
    (Standard)
       (Pinyin): jǐng (jing$^3$)
       (Zhuyin): ㄐㄧㄥˇ
    (Xi'an, Guanzhong Pinyin): jìng
    (Dungan, Cyrillic and Wiktionary): җин (žin, II)
* Cantonese
    (Guangzhou–Hong Kong, Jyutping): zeng$^2$ / zing$^2$
    (Dongguan, Jyutping++): zoeng$^2$ / zeang$^2$
    (Taishan, Wiktionary): diang$^2$ / den$^2$
* Gan (Wiktionary): jiang$^3$ / jin$^3$
* Hakka
    (Sixian, PFS): chiáng
    (Hailu, HRS): ziang$^ˊ$
    (Meixian, Guangdong): jiang$^3$
* Jin (Wiktionary): jing$^2$
* Northern Min (KCR): cǎng
* Eastern Min (BUC): cāng / ciāng
* Puxian Min (Pouseng Ping'ing): za$^3$ / zaⁿ$^3$ / zing$^3$
* Southern Min
    (Hokkien, POJ): chíⁿ / chéⁿ / chéng
    (Teochew, Peng'im): zên$^2$
    (Leizhou, Leizhou Pinyin): ze$^2$ / jing$^2$
* Southern Pinghua (Nanning, Jyutping++): zang$^2$
* Wu (Shanghai, Wugniu): $^5$cin
* Xiang (Changsha, Wiktionary): zin$^3$
* Mandarin
** (Standard Chinese)
*** Hanyu Pinyin: jǐng
*** Zhuyin: ㄐㄧㄥˇ
*** Tongyong Pinyin: jǐng
*** Wade–Giles: ching$^3$
*** Yale: jǐng
*** Gwoyeu Romatzyh: jiing
*** Palladius: цзин (czin)
*** Sinological IPA : /t͡ɕiŋ²¹⁴/
** (Xi'an)
*** Guanzhong Pinyin: jìng
*** Sinological IPA : /t͡ɕiŋ⁵³/
** (Dungan)
*** Cyrillic and Wiktionary: җин (žin, II)
*** Sinological IPA : /t͡ɕiŋ⁵¹/
    (Note: Dungan pronunciation is currently experimental and may be inaccurate.)
* Cantonese
** (Standard Cantonese, Guangzhou–Hong Kong)
*** Jyutping: zeng$^2$ / zing$^2$
*** Yale: jéng / jíng
*** Cantonese Pinyin: dzeng$^2$ / dzing$^2$
*** Guangdong Romanization: zéng$^2$ / jing$^2$
*** Sinological IPA : /t͡sɛːŋ³⁵/, /t͡sɪŋ³⁵/
* zeng2 - vernacular;
* zing2 - literary.
* Middle Chinese: tsjengX
Rime :
| Character | 井 |
| Reading # | 1/1 |
| Initial (聲) | 精 (13) |
| Final (韻) | 清 (121) |
| Tone (調) | Rising (X) |
| Openness (開合) | Open |
| Division (等) | III |
| Fanqie | 子郢切 |
| Baxter | tsjengX |
| Reconstructions ||
| Zhengzhang Shangfang | /t͡siᴇŋ$^X$/ |
| Pan Wuyun | /t͡siɛŋ$^X$/ |
| Shao Rongfen | /t͡siæŋ$^X$/ |
| Edwin Pulleyblank | /t͡siajŋ$^X$/ |
| Li Rong | /t͡siɛŋ$^X$/ |
| Wang Li | /t͡sĭɛŋ$^X$/ |
| Bernhard Karlgren | /t͡si̯ɛŋ$^X$/ |
| Expected Mandarin Reflex | jǐng |
| Expected Cantonese Reflex | zing$^2$ |
* Old Chinese
    (Baxter–Sagart): /*C.tseŋʔ/
    (Zhengzhang): /*skeŋʔ/
Baxter–Sagart system 1.1 (2014) :
| Character | 井 |
| Reading # | 1/1 |
| Modern Beijing (Pinyin) | jǐng |
| Middle Chinese | ‹ tsjeng$^X$ › |
| Old Chinese | /*C.tseŋʔ/ |
| English | well (n.) |
| Notes for Old Chinese notations in the Baxter–Sagart system: * Parentheses "" indicate uncertain presence; * Square brackets "" indicate uncertain identity, e.g. *[t] as coda may in fact be *-t or *-p; * Angle brackets "<>" indicate infix; * Hyphen "-" indicates morpheme boundary; * Period "." indicates syllable boundary. ||
Zhengzhang system (2003) :
| Character | 井 |
| Reading # | 1/1 |
| No. | 6852 |
| Phonetic component | 井 |
| Rime group | 耕 |
| Rime subdivision | 0 |
| Corresponding MC rime | 井 |
| Old Chinese | /*skeŋʔ/ |
| Notes | 丼注今體甲金文爲型初文 |

#### Definitions

井
* well (a hole sunk into the ground) (Classifier: 口; 眼)
* well-shaped object; mineshaft, pit
* hometown
* neat; tidy
    井井有條／井井有条 ― jǐngjǐngyǒutiáo ― neat and tidy
* 48th hexagram of the I Ching
* a surname

##### Synonyms

| Variety | Location | Words |
| Classical Chinese | Classical Chinese | 井 |
| Formal (Written Standard Chinese) | Formal (Written Standard Chinese) | 水井, 井 |
| Northeastern Mandarin | Beijing | 水井, 井 |
| Northeastern Mandarin | Chengde | 井 |
| Northeastern Mandarin | Chifeng | 井 |
| Northeastern Mandarin | Hulunbuir (Hailar) | 井 |
| Northeastern Mandarin | Heihe | 井 |
| Northeastern Mandarin | Qiqihar | 井 |
| Northeastern Mandarin | Harbin | 水井, 井 |
| Northeastern Mandarin | Jiamusi | 井 |
| Northeastern Mandarin | Baicheng | 井 |
| Northeastern Mandarin | Changchun | 井 |
| Northeastern Mandarin | Tonghua | 井 |
| Northeastern Mandarin | Shenyang | 井 |
| Northeastern Mandarin | Jinzhou | 井 |
| Northeastern Mandarin | Singapore | 水井, 井 |
| Jilu Mandarin | Tianjin | 井 |
| Jilu Mandarin | Tangshan | 井 |
| Jilu Mandarin | Cangzhou | 井 |
| Jilu Mandarin | Baoding | 井 |
| Jilu Mandarin | Shijiazhuang | 井 |
| Jilu Mandarin | Lijin | 井 |
| Jilu Mandarin | Jinan | 水井, 井 |
| Jiaoliao Mandarin | Dalian | 井 |
| Jiaoliao Mandarin | Dandong | 井 |
| Jiaoliao Mandarin | Yantai | 井 |
| Jiaoliao Mandarin | Yantai (Muping) | 水井, 井 |
| Jiaoliao Mandarin | Qingdao | 井 |
| Jiaoliao Mandarin | Zhucheng | 井 |
| Central Plains Mandarin | Luoyang | 井 |
| Central Plains Mandarin | Lingbao | 井 |
| Central Plains Mandarin | Jining | 井 |
| Central Plains Mandarin | Wanrong | 井 |
| Central Plains Mandarin | Linfen | 井 |
| Central Plains Mandarin | Shangqiu | 井 |
| Central Plains Mandarin | Yuanyang | 井 |
| Central Plains Mandarin | Zhengzhou | 井 |
| Central Plains Mandarin | Xinyang | 井 |
| Central Plains Mandarin | Baihe | 井 |
| Central Plains Mandarin | Xi'an | 井 |
| Central Plains Mandarin | Baoji | 井 |
| Central Plains Mandarin | Tianshui | 井 |
| Central Plains Mandarin | Xining | 水井, 井 |
| Central Plains Mandarin | Xuzhou | 水井, 井 |
| Central Plains Mandarin | Fuyang | 井 |
| Lanyin Mandarin | Yinchuan | 井 |
| Lanyin Mandarin | Lanzhou | 井 |
| Lanyin Mandarin | Dunhuang | 井 |
| Lanyin Mandarin | Hami | 井 |
| Lanyin Mandarin | Ürümqi | 井 |
| Southwestern Mandarin | Chengdu | 井 |
| Southwestern Mandarin | Nanchong | 水井, 井 |
| Southwestern Mandarin | Dazhou | 井 |
| Southwestern Mandarin | Hanyuan | 井 |
| Southwestern Mandarin | Xichang | 井 |
| Southwestern Mandarin | Zigong | 井 |
| Southwestern Mandarin | Chongqing | 水井, 井 |
| Southwestern Mandarin | Wuhan | 井 |
| Southwestern Mandarin | Yichang | 井 |
| Southwestern Mandarin | Xiangyang | 井 |
| Southwestern Mandarin | Tianmen | 井 |
| Southwestern Mandarin | Guiyang | 水井, 井 |
| Southwestern Mandarin | Zunyi | 水井, 井 |
| Southwestern Mandarin | Bijie | 水井, 井 |
| Southwestern Mandarin | Liping | 井, 吊井 |
| Southwestern Mandarin | Zhaotong | 井 |
| Southwestern Mandarin | Dali | 井 |
| Southwestern Mandarin | Kunming | 水井, 井 |
| Southwestern Mandarin | Mengzi | 井 |
| Southwestern Mandarin | Guilin | 井 |
| Southwestern Mandarin | Liuzhou | 水井, 井 |
| Southwestern Mandarin | Jishou | 井, 吊井 |
| Southwestern Mandarin | Changde | 井 |
| Southwestern Mandarin | Hanzhong | 井 |
| Jianghuai Mandarin | Nanjing | 井 |
| Jianghuai Mandarin | Yangzhou | 井 |
| Jianghuai Mandarin | Lianyungang | 井 |
| Jianghuai Mandarin | Lianshui | 井 |
| Jianghuai Mandarin | Nantong | 井 |
| Jianghuai Mandarin | Anqing | 井 |
| Jianghuai Mandarin | Wuhu | 井 |
| Jianghuai Mandarin | Hefei | 井 |
| Jianghuai Mandarin | Hong'an | 井, 涼水井 |
| Cantonese | Guangzhou | 井 |
| Cantonese | Hong Kong | 井 |
| Cantonese | Hong Kong (San Tin; Weitou) | 井 |
| Cantonese | Hong Kong (Kam Tin; Weitou) | 井 |
| Cantonese | Hong Kong (Ting Kok) | 井 |
| Cantonese | Hong Kong (Tung Ping Chau) | 水井 |
| Cantonese | Macau | 井 |
| Cantonese | Guangzhou (Panyu) | 井 |
| Cantonese | Guangzhou (Huashan, Huadu) | 井 |
| Cantonese | Guangzhou (Conghua) | 井 |
| Cantonese | Guangzhou (Zengcheng) | 井 |
| Cantonese | Foshan | 井 |
| Cantonese | Foshan (Shatou, Nanhai) | 井 |
| Cantonese | Foshan (Shunde) | 井 |
| Cantonese | Foshan (Sanshui) | 井 |
| Cantonese | Foshan (Mingcheng, Gaoming) | 水井 |
| Cantonese | Zhongshan (Shiqi) | 井 |
| Cantonese | Zhuhai (Qianshan, Xiangzhou) | 井 |
| Cantonese | Zhuhai (Shangheng, Doumen; Tanka) | 井 |
| Cantonese | Zhuhai (Doumen) | 井 |
| Cantonese | Jiangmen (Baisha) | 井 |
| Cantonese | Jiangmen (Xinhui) | 井 |
| Cantonese | Taishan | 水井, 井 |
| Cantonese | Kaiping (Chikan) | 井 |
| Cantonese | Enping (Niujiang) | 井 |
| Cantonese | Heshan (Yayao) | 水井 |
| Cantonese | Dongguan | 井 |
| Cantonese | Shenzhen (Shajing, Bao'an) | 井 |
| Cantonese | Kuala Lumpur (Guangfu) | 水井, 井 |
| Gan | Nanchang | 井 |
| Gan | Lichuan | 井 |
| Hakka | Meixian | 井 |
| Hakka | Huizhou (Huicheng; Bendihua) | 井 |
| Hakka | Dongguan (Qingxi) | 井 |
| Hakka | Shenzhen (Shatoujiao) | 井 |
| Hakka | Zhongshan (Nanlang Heshui) | 井 |
| Hakka | Guangzhou (Lütian, Conghua) | 井 |
| Hakka | Yudu | 井 |
| Hakka | Hong Kong | 井 |
| Hakka | Senai (Huiyang) | 井 |
| Huizhou | Jixi | 井 |
| Huizhou | Shexian | 井 |
| Jin | Taiyuan | 井, 井兒 |
| Jin | Yangyuan | 井 |
| Jin | Datong | 井 |
| Jin | Xinzhou | 水井, 井 |
| Jin | Lüliang (Lishi) | 井兒 |
| Jin | Changzhi | 井 |
| Jin | Linhe | 井 |
| Jin | Jining | 井 |
| Jin | Hohhot | 井 |
| Jin | Erenhot | 井 |
| Jin | Pingshan | 井 |
| Jin | Zhangjiakou | 井, 土井 |
| Jin | Handan | 井 |
| Jin | Linzhou | 井 |
| Jin | Suide | 井, 井子 |
| Northern Min | Jian'ou | 水井 |
| Eastern Min | Fuzhou | 水井, 井 |
| Southern Min | Xiamen | 鼓井, 井, 水井 |
| Southern Min | Quanzhou | 鼓井, 水井 |
| Southern Min | Jinjiang | 鼓井 |
| Southern Min | Zhangzhou | 鼓井, 水井 |
| Southern Min | Taipei | 井 |
| Southern Min | New Taipei (Tamsui) | 井, 鼓井 |
| Southern Min | New Taipei (Sanxia) | 井 |
| Southern Min | New Taipei (Pingxi) | 井 |
| Southern Min | Kaohsiung | 井 |
| Southern Min | Kaohsiung (Cijin) | 井 |
| Southern Min | Kaohsiung (Hongmaogang, Siaogang) | 井 |
| Southern Min | Kaohsiung (Dalinpu, Siaogang) | 井 |
| Southern Min | Kaohsiung (Tianliao) | 井 |
| Southern Min | Tainan (Anping) | 井 |
| Southern Min | Kinmen | 井 |
| Southern Min | Penghu (Magong) | 井 |
| Southern Min | Penghu (Xiyu) | 井 |
| Southern Min | Penang (Hokkien) | 井 |
| Southern Min | Singapore (Hokkien) | 井 |
| Southern Min | Zhangping (Yongfu) | 鼓井 |
| Southern Min | Chaozhou | 井 |
| Southern Min | Bangkok (Teochew) | 水井 |
| Southern Min | Johor Bahru (Teochew) | 水井 |
| Southern Min | Leizhou | 井 |
| Southern Min | Haikou | 水井 |
| Zhongshan Min | Zhongshan (Longdu, Shaxi) | 井 |
| Southern Pinghua | Nanning (Tingzi) | 井, 打井 |
| Wu | Shanghai (Chongming) | 井 |
| Wu | Suzhou | 井 |
| Wu | Danyang | 井 |
| Wu | Hangzhou | 水井 |
| Wu | Ningbo | 水井, 井 |
| Wu | Wenzhou | 水井, 井 |
| Wu | Jinhua | 井 |
| Xiang | Changsha | 水井, 吊井 |
| Xiang | Shuangfeng | 井 |

#### Compounds

* 下井投石
* 三眼井 (Sānyǎnjǐng)
* 丘井
* 丹砂井
* 乾井 / 干井 (gānjǐng)
* 井中求火
* 井中視星 / 井中视星
* 井井有條 / 井井有条 (jǐngjǐngyǒutiáo)
* 井井有理
* 井口邊草 / 井口边草
* 井地
* 井字棋 (jǐngzìqí)
* 井字過三關 / 井字过三关 (jǐngzìguòsānguān)
* 井字遊戲 / 井字游戏 (jǐngzì yóuxì)
* 井宿 (Jǐngxiù)
* 井幹 / 井干
* 井底之蛙 (jǐngdǐzhīwā)
* 井底銀瓶 / 井底银瓶
* 井架
* 井柱狀圖 / 井柱状图
* 井榦 / 井干
* 井水 (jǐngshuǐ)
* 井渫不食
* 井然 (jǐngrán)
* 井然有序 (jǐngrányǒuxù)
* 井田 (jǐngtián)
* 井田制度 (jǐngtián zhìdù)
* 井稅 / 井税
* 井穴
* 井窩子 / 井窝子
* 井繩 / 井绳
* 井臺 / 井台 (jǐngtái)
* 井臼
* 井蛙 (jǐngwā)
* 井蛙之見 / 井蛙之见 (jǐngwāzhījiàn)
* 井蛙語海 / 井蛙语海
* 井蛙醯雞 / 井蛙醯鸡
* 井逕 / 井迳
* 井闌 / 井阑
* 井陘縣 / 井陉县
* 井養 / 井养
* 井鮒 / 井鲋
* 井鹽 / 井盐
* 前井 (Qiánjǐng)
* 午井 (Wǔjǐng)
* 古井 (gǔjǐng)
* 古井不波
* 古井無波 / 古井无波
* 古井重波
* 坎井之蛙
* 坐井觀天 / 坐井观天 (zuòjǐngguāntiān)
* 坎兒井 / 坎儿井 (kǎnrjǐng)
* 天井 (tiānjǐng)
* 奔井投河
* 學如穿井 / 学如穿井
* 層次井然 / 层次井然
* 市井 (shìjǐng)
* 市井之人
* 市井之徒 (shìjǐngzhītú)
* 市井之臣
* 市井小人
* 市井小民
* 市井無賴 / 市井无赖 (shìjǐngwúlài)
* 從井救人 / 从井救人
* 心如古井
* 投井下石 (tóujǐngxiàshí)
* 投河逩井 / 投河奔井
* 投石下井
* 挑雪填井
* 掘井 (juéjǐng)
* 捫參歷井 / 扪参历井
* 操井臼
* 擔雪填井 / 担雪填井
* 擔雪塞井 / 担雪塞井
* 斷井頹垣 / 断井颓垣
* 旱井
* 景陽宮井 / 景阳宫井
* 枯井
* 條理井然 / 条理井然
* 棄井 / 弃井
* 橘井
* 氣井 / 气井
* 水井 (shuǐjǐng)
* 汲井
* 油井 (yóujǐng)
* 洋井
* 淺井 / 浅井 (qiǎnjǐng)
* 淘井 (táojǐng)
* 淘古井
* 涼水井 / 凉水井 (Liángshuǐjǐng)
* 渴而穿井
* 灣井 / 湾井 (Wānjǐng)
* 煤井
* 玉井 (Yùjǐng)
* 甘井先竭 (gānjǐngxiānjié)
* 眢井
* 石井 (Shíjǐng)
* 礦井 / 矿井 (kuàngjǐng)
* 秩序井然
* 稱鎚落井 / 称锤落井
* 窨井 (yìnjǐng)
* 管井
* 紡績井臼 / 纺绩井臼
* 綺井 / 绮井
* 耿恭拜井
* 背井離鄉 / 背井离乡 (bèijǐnglíxiāng)
* 胭脂井
* 臨噎掘井 / 临噎掘井
* 臨渴掘井 / 临渴掘井 (línkějuéjǐng)
* 臨渴穿井 / 临渴穿井
* 自操井臼
* 自流井 (zìliújǐng)
* 落井下石 (luòjǐngxiàshí)
* 藻井 (zǎojǐng)
* 虎井 (Hǔjǐng)
* 親操井臼 / 亲操井臼
* 踢天弄井
* 避井落坑
* 避坑落井 (bìkēngluòjǐng)
* 鄉井 / 乡井
* 金井
* 鑿井 / 凿井 (záojǐng)
* 開渠穿井 / 开渠穿井
* 開發井 / 开发井
* 阿井
* 離鄉背井 / 离乡背井 (líxiāngbèijǐng)
* 離鄉避井 / 离乡避井
* 露井
* 鹽井 / 盐井
* 龍井 / 龙井 (Lóngjǐng)
* 龍井茶 / 龙井茶

### Etymology 2

* For pronunciation and definitions of 井 – see 阱 (“pitfall, trap”). (This character is the second-round simplified form of 阱).
* Notes:Simplified Chinese is mainly used in Mainland China, Malaysia, and Singapore.Traditional Chinese is mainly used in Hong Kong, Macau, and Taiwan.

## Japanese
### Kanji

(Fourth grade kyōiku kanji)
* well

#### Readings

* Go-on: しょう (shō, Jōyō $^†$)
* Kan-on: せい (sei, Jōyō)
* Kun: い (i, 井, Jōyō)、いど (ido, 井)

#### Compounds

* 天井(てんじょう) (tenjō)

### Etymology 1

* Kanji in this term
* 井
* い Grade: 4
* kun'yomi
wi > i.

#### Pronunciation

* (Tokyo) い [íꜜ] (Atamadaka –)
* IPA: [i]

#### Noun

井(い) • (i)
* well (water source)

##### Derived terms

* 井(い)桁(けだ) (ikeda): well curb
* 井(い)堰(せき) (iseki)
* 井(い)戸(ど) (ido): well
* 井(い)筒(づつ) (izutsu)
* 井(い)綱(づな) (izuna)
* 井(い)守(もり) (imori): salamander, newt
* 筒(つつ)井(い) (tsutsui)

##### Proverbs

* 井(い)の中(なか)の蛙(かわず)大海(たいかい)を知(し)らず (i no naka no kawazu taikai o shirazu): metaphor of a narrow world view based on limited experience (literally, "a frog in a well does not know the great ocean")

#### Proper noun

井(い) • (I)
* a surname

### Etymology 2

* Kanji in this term
* 井
* せい Grade: 4
* on'yomi
From Middle Chinese 井 (tsjeng$^X$).

#### Pronunciation

* (Tokyo) せー [séꜜè] (Atamadaka –)
* IPA: [se̞ː]

#### Noun

井(せい) • (sei)
* well, well curb

##### Derived terms

* 井(せい)蛙(あ) (seia): frog in a well
* 井陘(せいけい) (Seikei)
* 井(せい)水(すい) (seisui): well water
* 井(せい)泉(せん) (seisen): well, well water
* 井(せい)底(てい) (seitei): bottom of a well
* 井(せい)目(もく) (seimoku)
* 甘(かん)井(せい) (kansei): sweet well
* 市(し)井(せい) (shisei)
* 油(ゆ)井(せい) (yusei): oil well

#### Proper noun

井(せい) • (Sei)
* (Chinese astronomy) Well (Chinese constellation)
    Hypernyms: 朱雀, 二十八宿

### References

* 1 2 Matsumura, Akira, editor (2006), 大辞林 [Daijirin] (in Japanese), Third edition, Tokyo: Sanseidō, →ISBN
* ↑ NHK Broadcasting Culture Research Institute, editor (1998), NHK日本語発音アクセント辞典 [NHK Japanese Pronunciation Accent Dictionary] (in Japanese), Tokyo: NHK Publishing, Inc., →ISBN

## Korean
### Etymology

From Middle Chinese 井 (MC tsjengX). Recorded as Middle Korean 져ᇰ〯 (cyěng) (Yale: cyeng) in Hunmong Jahoe (訓蒙字會 / 훈몽자회), 1527.

### Hanja

Wikisource 井 (eumhun 우물 정 (umul jeong))
* hanja form of 정 (“well (a hole sunk into the ground)”)

#### Compounds

* 유정 (油井, yujeong)
* 정수 (井水, jeongsu)

### References

* 국제퇴계학회 대구경북지부 (國際退溪學會 大邱慶北支部) (2007). Digital Hanja Dictionary, 전자사전／電子字典.

## Vietnamese
### Han character

井: Hán Nôm readings: tỉnh
* This term needs a translation to English. Please help out and add a translation, then remove the text {{rfdef}}.