# 玉莖
## Chinese
### Pronunciation

* Mandarin
    (Pinyin): yùjīng, yùjìng
    (Zhuyin): ㄩˋ ㄐㄧㄥ, ㄩˋ ㄐㄧㄥˋ
* Cantonese (Jyutping): juk$^6$ ging$^3$
* Mandarin
** (Standard Chinese)
*** Hanyu Pinyin: yùjīng
*** Zhuyin: ㄩˋ ㄐㄧㄥ
*** Tongyong Pinyin: yùjing
*** Wade–Giles: yü$^4$-ching$^1$
*** Yale: yù-jīng
*** Gwoyeu Romatzyh: yuhjing
*** Palladius: юйцзин (jujczin)
*** Sinological IPA : /y⁵¹ t͡ɕiŋ⁵⁵/
** (Standard Chinese, nonstandard or dialectal)
*** Hanyu Pinyin: yùjìng
*** Zhuyin: ㄩˋ ㄐㄧㄥˋ
*** Tongyong Pinyin: yùjìng
*** Wade–Giles: yü$^4$-ching$^4$
*** Yale: yù-jìng
*** Gwoyeu Romatzyh: yuhjinq
*** Palladius: юйцзин (jujczin)
*** Sinological IPA : /y⁵¹⁻⁵³ t͡ɕiŋ⁵¹/
* Cantonese
** (Standard Cantonese, Guangzhou–Hong Kong)
*** Jyutping: juk$^6$ ging$^3$
*** Yale: yuhk ging
*** Cantonese Pinyin: juk$^9$ ging$^3$
*** Guangdong Romanization: yug$^6$ ging$^3$
*** Sinological IPA : /jʊk̚² kɪŋ³³/

### Noun

玉莖
* (literary) penis

#### Synonyms

| Variety | Location | Words |
| Classical Chinese | Classical Chinese | 玉莖, 陽具, 陽物, 陰體, 人道, 身根 |
| Formal (Written Standard Chinese) | Formal (Written Standard Chinese) | 陰莖, 陽具, 男根 |
| Northeastern Mandarin | Beijing | 雞巴, 卵子, 家伙, 帽兒, 大帽兒, 雀子 †, 小雞兒 †, 小蟲兒 † |
| Northeastern Mandarin | Taiwan | 雞雞, 屌, 肉棒, 老二, 命根, 命根子, 小弟弟, 小鳥 †, 小雞雞 † |
| Northeastern Mandarin | Harbin | 雞巴, 雞巴嘚兒, 雞巴頭子, 嘚兒, 牛子, 老二, 二哥, 腿兒, 牛牛兒 †, 小牛子 †, 家雀兒 † |
| Northeastern Mandarin | Singapore | 小鳥 † |
| Jilu Mandarin | Jinan | 屌, 小雞兒 †, 小雞雞 † |
| Jiaoliao Mandarin | Yantai (Muping) | 鴨子, 雞子, 雞巴, 屌, 小鴨兒 † |
| Central Plains Mandarin | Luoyang | 雞巴, 屌, 膀, 雞巴兒 †, 小雞兒雞兒 † |
| Central Plains Mandarin | Wanrong | 鴨子, 鴨兒 † |
| Central Plains Mandarin | Xi'an | 㞗, 錘子, 牛牛兒 † |
| Central Plains Mandarin | Xining | 雞巴, 㞗, 錘子, 雞雞 † |
| Central Plains Mandarin | Xuzhou | 屌, 雞巴, 雞尜尜, 屌頭子, 老二, 二哥, 一家人兒, 打種的 dated, 小雞兒 †, 雞兒 †, 尜尜 †, 小老雀兒 †, 老雀兒 † |
| Central Plains Mandarin | Sokuluk (Gansu Dungan) | 㞗 |
| Lanyin Mandarin | Yinchuan | 㞗, 雞巴, 雞雞 † |
| Lanyin Mandarin | Lanzhou | 㞗, 牛牛子 † |
| Lanyin Mandarin | Ürümqi | 㞗, 㞗把子, 錘子, 雞雞 †, 㞗㞗 † |
| Southwestern Mandarin | Chengdu | 錘子, 雞巴, 雞棍兒, 雞兒, 雀雀兒, 雀雀, 麻雀兒, 毛鰱魚, 老二, 㞗, 雞雞 †, 小雞兒 †, 小麻雀兒 †, 小雀雀兒 † |
| Southwestern Mandarin | Chongqing | 錘子, 卵, 鷄兒, 鴨兒, 雀雀兒, 鷄巴, 㞗, 牙刷兒 |
| Southwestern Mandarin | Wuhan | 鴨蒂, 雞巴, 卵, 雀雀 †, 鴨鴨 †, 雞雞 † |
| Southwestern Mandarin | Guiyang | 雞巴, 大雞巴, 乾雞巴, 馬雞巴, 卵子, 㞗, 屌, 下二哥, 二哥, 甩甩, 錘錘 dated, 錘子 dated, 雞雞 †, 小雞兒 †, 雞兒 †, 麻雀 †, 小麻雀 †, 雀雀 † |
| Southwestern Mandarin | Liuzhou | 鳥, 卵, 二老爺, 大頭蟲, 鳥崽 † |
| Jianghuai Mandarin | Nanjing | 雞巴, 屌, 麻雀, 小麻雀兒 † |
| Jianghuai Mandarin | Yangzhou | 雞巴, 屌子, 屌, 卵子, 麻雀子 † |
| Jianghuai Mandarin | Nantong | 屌兒, 屌 |
| Jianghuai Mandarin | Hefei | 屌, 雞巴, 尕尕雞 †, 尕雞 † |
| Jianghuai Mandarin | Huanggang | 卵, 雞巴 |
| Cantonese | Guangzhou | 鳩, 𨳍, 𡳞, 賓周, 小便, 祠堂, 脧 †, 脧脧 †, 鳩脧 †, 脧仔 †, 咕咕 †, 雀仔 †, 慈姑椗 † |
| Cantonese | Hong Kong | 鳩, 𨳍, 𡳞, 賓周, 周, 周周, 雀, 弟弟, 細佬, 何B仔, 子孫根, 祠堂, 第三隻腳, 第五肢, 是非根, J slang, 丁 slang, 丁丁 slang, 腸 slang, 腸仔 slang, 嘢 euphemistic, 脧 †, 脧脧 †, 脧脧仔 †, 咕咕 †, 雀仔 †, 慈姑椗 † |
| Cantonese | Hong Kong (San Tin Weitou) | 𡳞, 鵝仔 † |
| Cantonese | Hong Kong (Kam Tin Weitou) | 鵝仔, 𡳞 |
| Cantonese | Hong Kong (Ting Kok) | 𡳞, 𡳞仔 † |
| Cantonese | Hong Kong (Tung Ping Chau) | 𡳞 |
| Cantonese | Macau | 鳩 |
| Cantonese | Guangzhou (Panyu) | 鳩, 𨳍 |
| Cantonese | Guangzhou (Huashan, Huadu) | 鳩 |
| Cantonese | Guangzhou (Conghua) | 鳩 |
| Cantonese | Guangzhou (Zengcheng) | 鳩 |
| Cantonese | Foshan | 鳩 |
| Cantonese | Foshan (Shatou, Nanhai) | 鳩 |
| Cantonese | Foshan (Shunde) | 鳩 |
| Cantonese | Foshan (Sanshui) | 鳩, 𨳍 |
| Cantonese | Foshan (Mingcheng, Gaoming) | 鳩 |
| Cantonese | Zhongshan (Shiqi) | 鳩, 𨳍 |
| Cantonese | Zhuhai (Qianshan, Xiangzhou) | 𨳍 |
| Cantonese | Zhuhai (Shangheng, Doumen; Tanka) | 鳩脧, 𨳍 |
| Cantonese | Zhuhai (Doumen) | 𨳍, 鳩 |
| Cantonese | Jiangmen (Baisha) | 雀, 𡳞 |
| Cantonese | Jiangmen (Xinhui) | 𡳞, 鳩 |
| Cantonese | Taishan | 𡳞, 雀 †, 雀仔 † |
| Cantonese | Kaiping (Chikan) | 𡳞, 𨳍 |
| Cantonese | Enping (Niujiang) | 𡳞, 𨳍 |
| Cantonese | Heshan (Yayao) | 𨳍 |
| Cantonese | Dongguan | 𡳞, 鵝必 † |
| Cantonese | Shenzhen (Shajing, Bao'an) | 𡳞 |
| Cantonese | Qingyuan | 鳩 |
| Cantonese | Fogang | 𨳍 |
| Cantonese | Yingde (Hanguang) | 鳩 |
| Cantonese | Yangshan | 巧 |
| Cantonese | Lianzhou (Qingshui Sihui) | 巧 |
| Cantonese | Shaoguan | 𨳍 |
| Cantonese | Shaoguan (Qujiang) | 鳩 |
| Cantonese | Renhua | 𡳞子 |
| Cantonese | Lechang | 雞巴, 𨳍 |
| Cantonese | Zhaoqing (Gaoyao) | 鳩 |
| Cantonese | Sihui | 巧, 鳩, 𨳍 |
| Cantonese | Guangning | 巧 |
| Cantonese | Deqing | 屌, 𨳍 |
| Cantonese | Huaiji | 鳩 |
| Cantonese | Fengkai (Nanfeng) | 鳩 |
| Cantonese | Yunfu | 𨳍 |
| Cantonese | Xinxing | 𨳍 |
| Cantonese | Luoding | 𨳍 |
| Cantonese | Yunan (Pingtai) | 鳩 |
| Cantonese | Yangjiang | 鳩, 𨳍 |
| Cantonese | Xinyi | 𨳍 |
| Cantonese | Nanning | 𨳍 |
| Cantonese | Hepu (Lianzhou) | 鳩脧 |
| Cantonese | Kuala Lumpur (Guangfu) | 𡳞, 鳩, 𨳍 |
| Cantonese | Ipoh (Guangfu) | 屌, 𨳍, 𡳞, 咕咕, 雀仔, 水喉, 大鵰, 賓周, 慈姑椗 |
| Cantonese | Singapore (Guangfu) | 𡳞, 鳩, 𨳍 |
| Cantonese | Ho Chi Minh City (Guangfu) | 賓周 |
| Gan | Nanchang | 卵, 卵雞子 †, 卵雞 † |
| Gan | Lichuan | 卵, 老二 |
| Gan | Pingxiang | 卵, 卵仔 †, 雞仔 † |
| Hakka | Meixian | 𡳞棍, 𡳞仔, 𡳞, 脧, 脧仔 † |
| Hakka | Xingning | 脧哩, 𡳞棍 |
| Hakka | Huizhou (Huicheng Bendihua) | 𡳞, 𡳞棍, 脧 †, 咕咕 † |
| Hakka | Huidong (Daling) | 𡳞棍, 脧仔 |
| Hakka | Dongguan (Qingxi) | 脧 |
| Hakka | Shenzhen (Shatoujiao) | 脧 |
| Hakka | Zhongshan (Wuguishan) | 𡳞, 脧 |
| Hakka | Zhongshan (Nanlang Heshui) | 𨳍 |
| Hakka | Wuhua (Shuizhai) | 脧哩, 𡳞棍 |
| Hakka | Wuhua (Huacheng) | 脧哩, 脧, 𡳞棍 |
| Hakka | Wuhua (Changbu) | 脧 |
| Hakka | Wuhua (Mianyang) | 脧哩, 𡳞棍 |
| Hakka | Heyuan (Bendihua) | 𡳞 |
| Hakka | Wengyuan | 𡳞子 |
| Hakka | Shaoguan (Qujiang) | 𡳞棍 |
| Hakka | Lianshan (Xiaosanjiang) | 𡳞棍, 脧 |
| Hakka | Liannan | 脧子 |
| Hakka | Guangzhou (Lütian, Conghua) | 𨳍 |
| Hakka | Jiexi | 脧 |
| Hakka | Zhao'an (Xiuzhuan) | 𡳞 |
| Hakka | Changting | 𡳞子, 𡳞 |
| Hakka | Wuping | 𡳞 |
| Hakka | Wuping (Yanqian) | 𡳞子 |
| Hakka | Wuping (Pingyu) | 𡳞 |
| Hakka | Liancheng | 𡳞, 脧 |
| Hakka | Ninghua | 脧 |
| Hakka | Yudu | 卵, 卵子 †, 尒卵子 † |
| Hakka | Ningdu | 卵 |
| Hakka | Ruijin | 卵陀 |
| Hakka | Shicheng | 卵梗 |
| Hakka | Shangyou (Shexi) | 卵 |
| Hakka | Tonggu (Sandu) | 卵子 |
| Hakka | Ganzhou (Panlong) | 卵 |
| Hakka | Dayu | 卵 |
| Hakka | Miaoli (N. Sixian) | 𡳞, 脧, 脧仔 |
| Hakka | Miaoli (Zaoqiao; N. Sixian) | 脧仔 |
| Hakka | Miaoli (Touwu; N. Sixian) | 脧仔 |
| Hakka | Miaoli (Nanzhuang; N. Sixian) | 𡳞棍 |
| Hakka | Miaoli (Shitan; N. Sixian) | 𡳞棍 |
| Hakka | Miaoli (Sanwan; N. Sixian) | 𡳞棍 |
| Hakka | Miaoli (Toufen; N. Sixian) | 𡳞棍 |
| Hakka | Miaoli (Gongguan; N. Sixian) | 𡳞, 𡳞棍, 脧仔 |
| Hakka | Miaoli (Zhuolan; N. Sixian) | 𡳞棍, 脧仔 |
| Hakka | Pingtung (Neipu; S. Sixian) | 𡳞 |
| Hakka | Pingtung (Wuluo, Ligang; S. Sixian) | 𡳞 |
| Hakka | Kaohsiung (Meinong; S. Sixian) | 𡳞, 脧仔 |
| Hakka | Kaohsiung (Shanlin; S. Sixian) | 𡳞 |
| Hakka | Hsinchu County (Zhudong; Hailu) | 𡳞棍 |
| Hakka | Taichung (Dongshi; Dabu) | 𡳞棍 |
| Hakka | Hsinchu County (Qionglin; Raoping) | 𡳞棍 |
| Hakka | Miaoli (Zhuolan; Raoping) | 脧 |
| Hakka | Yunlin (Lunbei; Zhao'an) | 脧子 |
| Hakka | Hong Kong | 𡳞, 脧 † |
| Hakka | Mengshan (Xihe) | 𡳞 |
| Hakka | Luchuan | 脧 |
| Hakka | Sabah (Bao'an) | 𡳞棍, 𡳞 |
| Hakka | Sabah (Longchuan) | 脧仔 |
| Hakka | Senai (Huiyang) | 𡳞棍 |
| Hakka | Singkawang | 脧 |
| Huizhou | Jixi | 鳥, 老八鳥, 八鳥 |
| Huizhou | Shexian | 鳥 |
| Huizhou | Huangshan (Tunxi) | 雞兒, 鳥兒 |
| Huizhou | Xiuning | 鳥, 卵, 雞兒, 雞雞 †, 下身 euphemistic |
| Huizhou | Yixian | 卵 |
| Huizhou | Qimen | 屌兒 |
| Huizhou | Wuyuan | 菩蒂 |
| Jin | Taiyuan | 㞗, 雞巴, 雀兒, 雞雞 †, 狗雞兒 † |
| Jin | Taiyuan (Jiancaoping) | 雞巴, 㞗 |
| Jin | Pingyao | 㞗兒, 秤桿, 狗雞兒 †, 雞兒 †, 狗雞雞 † |
| Jin | Xinzhou | 㞗, 雞巴, 雞雞, 二掌櫃, 小腹, 雞溜子 †, 雞溜 †, 毛㞗 of an adult |
| Jin | Shenmu | 㞗, 屌子, 雞溜子, 雞雞 †, 沙奶奶 † |
| Northern Min | Jian'ou | 𫵓, 𫵓仔, 𫵓𫵓仔 † |
| Northern Min | Jian'ou (Dikou) | 𫵓 |
| Northern Min | Songxi | 𫵓 |
| Northern Min | Zhenghe | 𫵓 |
| Northern Min | Zhenghe (Zhenqian) | 𫵓牯 |
| Northern Min | Jianyang | 𫵓 |
| Northern Min | Wuyishan | 脧 |
| Northern Min | Pucheng (Shibei) | 脧 |
| Eastern Min | Fuzhou | 欛欛, 䐯鳥, 欛欛囝 †, 鳥鳥囝 †, 䐯鳥囝 † |
| Eastern Min | Fuzhou (Changle) | 欛欛囝 |
| Eastern Min | Fuqing | 䐯, 鳥 † |
| Eastern Min | Yongtai | 䐯鳥 |
| Eastern Min | Gutian | 䐯鳥 |
| Eastern Min | Fu'an | 䐯鳥 |
| Eastern Min | Ningde | 䐯 |
| Eastern Min | Shouning | 䐯鳥 |
| Eastern Min | Zhouning | 䐯鳥 |
| Eastern Min | Fuding | 䐯䐯, 䐯鳥 |
| Eastern Min | Matsu | 欛欛 |
| Southern Min | Xiamen | 𡳞鳥, 𡳞𦉎, 𡳞, 鳥仔 † |
| Southern Min | Xiamen (Tong'an) | 𡳞鳥 |
| Southern Min | Quanzhou | 𡳞鳥, 𡳞𦉎, 𡳞, 鳥仔 † |
| Southern Min | Jinjiang | 𡳞鳥 |
| Southern Min | Anxi | 𡳞鳥 |
| Southern Min | Yongchun | 𡳞鳥 |
| Southern Min | Zhangzhou | 𡳞鳥, 𡳞𦉎, 𡳞, 鳥仔 † |
| Southern Min | Zhangpu | 𡳞 |
| Southern Min | Zhao'an | 𡳞鳥 |
| Southern Min | Dongshan | 𡳞鳥, 𡳞鳥仔 † |
| Southern Min | Taipei | 𡳞鳥 |
| Southern Min | Taipei (Wanhua) | 𡳞鳥 |
| Southern Min | New Taipei (Tamsui) | 𡳞鳥 |
| Southern Min | New Taipei (Sanxia) | 𡳞鳥 |
| Southern Min | New Taipei (Pingxi) | 𡳞鳥 |
| Southern Min | Kaohsiung | 𡳞鳥 |
| Southern Min | Kaohsiung (Cijin) | 𡳞鳥 |
| Southern Min | Kaohsiung (Hongmaogang, Siaogang) | 𡳞鳥 |
| Southern Min | Kaohsiung (Dalinpu, Siaogang) | 𡳞鳥 |
| Southern Min | Kaohsiung (Tianliao) | 𡳞鳥 |
| Southern Min | Yilan | 𡳞鳥 |
| Southern Min | Yilan (Luodong) | 𡳞鳥 |
| Southern Min | Yilan (Toucheng) | 𡳞鳥 |
| Southern Min | Changhua (Lukang) | 𡳞鳥 |
| Southern Min | Taichung | 𡳞鳥 |
| Southern Min | Taichung (Wuqi) | 𡳞鳥 |
| Southern Min | Tainan | 𡳞鳥, 戛, 訶 |
| Southern Min | Tainan (Anping) | 𡳞鳥 |
| Southern Min | Taitung | 𡳞鳥 |
| Southern Min | Hsinchu | 𡳞鳥 |
| Southern Min | Kinmen | 𡳞鳥 |
| Southern Min | Penghu (Magong) | 𡳞鳥 |
| Southern Min | Penghu (Xiyu) | 𡳞鳥 |
| Southern Min | Penang (Hokkien) | 𡳞鳥, 𡳞, 小弟, 咕咕鳥, 咕咕 |
| Southern Min | Singapore (Hokkien) | 𡳞鳥, 𡳞, 弟弟, 小弟, 咕咕鳥 †, childish |
| Southern Min | Manila (Hokkien) | 𡳞鳥 |
| Southern Min | Zhangping (Yongfu) | 𡳞, 𡳞公仔 † |
| Southern Min | Datian | 𡳞鳥 |
| Southern Min | Pingnan (Shangdu) | 鳩 |
| Southern Min | Chaozhou | 𡳞鳥, 𡳞 |
| Southern Min | Raoping | 𡳞鳥, 𡳞 |
| Southern Min | Shantou | 𡳞鳥, 𡳞 |
| Southern Min | Shantou (Chenghai) | 𡳞 |
| Southern Min | Shantou (Chaoyang) | 𡳞鳥 |
| Southern Min | Nan'ao (Houzhai) | 𡳞 |
| Southern Min | Nan'ao (Yun'ao) | 𡳞 |
| Southern Min | Jieyang | 𡳞鳥, 𡳞, 鳥 †, 龜鳥 † |
| Southern Min | Haifeng | 𡳞鳥 |
| Southern Min | Bangkok (Teochew) | 鳥, 𡳞, 𡳞鳥囝 † |
| Southern Min | Chiang Mai (Teochew) | 𡳞 |
| Southern Min | Hat Yai (Teochew) | 𡳞, 𡳞鳥囝 † |
| Southern Min | Johor Bahru (Teochew) | 𡳞 |
| Southern Min | Singapore (Teochew) | 𡳞鳥, 𡳞 |
| Southern Min | Leizhou | 𡳞, 鳥, 殼車, 家私, 尻川柄 |
| Southern Min | Wenchang | 頹 |
| Southern Min | Haikou | 頹, 鳥 † |
| Puxian Min | Putian | 𡳞, 𡳞囝 |
| Puxian Min | Putian (Donghai, Chengxiang) | 𡳞, 𡳞鳥, 𡳞鳥囝 † |
| Puxian Min | Putian (Jiangkou, Hanjiang) | 𡳞, 𡳞囝 |
| Puxian Min | Putian (Nanri, Xiuyu) | 𡳞, 𡳞囝, 𡳞鳥 †, 𡳞鳥囝 † |
| Puxian Min | Xianyou | 𡳞, 𡳞鳥, 𡳞鳥囝 † |
| Puxian Min | Xianyou (Fengting) | 𡳞, 𡳞鳥, 𡳞鳥囝 † |
| Puxian Min | Xianyou (Youyang) | 𡳞, 𡳞鳥, 𡳞鳥囝 † |
| Central Min | Yong'an | 脧 |
| Central Min | Sanming (Sanyuan) | 脧 |
| Central Min | Sanming (Shaxian) | 脧仔 |
| Zhongshan Min | Zhongshan (Sanxiang) | 卵, 卵脬 |
| Southern Pinghua | Nanning (Tingzi) | 𨳍, 麻鳥, 二老弟, 慈姑椗 † |
| Shehua | Fu'an | 𡳞仔 |
| Shehua | Fuding | 𡳞仔 |
| Shehua | Luoyuan | 𡳞仔 |
| Shehua | Sanming | 𡳞仔 |
| Shehua | Shunchang | 𡳞仔 |
| Shehua | Hua'an | 𡳞仔 |
| Shehua | Guixi (Zhangping) | 𡳞仔 |
| Shehua | Cangnan | 𡳞仔 |
| Shehua | Jingning (Hexi) | 𡳞 |
| Shehua | Lishui | 𡳞 |
| Shehua | Longyou | 𡳞鳥 |
| Shehua | Chaozhou | 𡳞仔 |
| Shehua | Fengshun | 𡳞仔 |
| Wu | Shanghai | 卵, 屌屌 †, 屌屌頭 †, 小雞雞 †, 麻鳥 † |
| Wu | Shanghai (Chongming) | 卵, 卵子, 卵卵 †, 小尿螺 † |
| Wu | Suzhou | 卵, 鳥, 雞雞 †, 小卵 †, 長生果 † |
| Wu | Wuxi | 卵 |
| Wu | Danyang | 卵, 卵子, 屌子, 屌, 雞巴, 雞雞 †, 小雀雀 †, 雀雀 †, 八八 †, 八雞 † |
| Wu | Hangzhou | 雀兒, 八屌, 卵脬, 小八屌 †, 麻雀兒 †, 麻油壺兒 † |
| Wu | Ningbo | 卵, 卵子, 卵瓜瓜 †, 瓜瓜 † |
| Wu | Wenzhou | 頹, 卵脬, 卵脬兒, 臀卵脬, 脬兒 †, 脬脬兒 †, 奶哥鳥兒 † |
| Wu | Jinhua | 老八兒, 聊子, 雀, 雞巴, 八兒八兒 † |
| Xiang | Changsha | 卵, 雞巴, 掉它, 太鬍子, 雞雞 †, 鳥鳥 †, 鳥 †, 梗梗 † |
| Xiang | Loudi | 雞巴, 卵, 勺欛腦殼, 雞雞 †, 雞崽唧 † |
| Xiang | Shuangfeng | 卵子, 雞蓀子 † |
| Xiang | Quanzhou | 屌把 |
| Note | † - of a boy | † - of a boy |

#### Descendants

* → Japanese: 玉茎(ぎょっけい) (gyokkei)
* → Korean: 옥경(玉莖) (okgyeong)
* → Vietnamese: ngọc hành (玉莖)