# mercury
## English
### Alternative forms

* mercurie (obsolete)
* ☿ (alchemy)

### Etymology

From Middle English mercurie, borrowed from Latin Mercurius. The chemical name comes from the planet Mercury. In medieval alchemy, the seven known metals—quicksilver, gold, silver, copper, iron, lead, and tin—were associated with the seven planets. Quicksilver was associated with the fastest planet, named after the Roman god Mercury, associated with speed and mobility. The astrological symbol for the planet became one of the alchemical symbols for the metal, and Mercury became an alternative name for the metal. Mercury is the only metal for which the alchemical planetary name survives, as it was decided it was preferable to quicksilver as a chemical name.
The chemical symbol Hg came from Latin hydrargyrus.

### Pronunciation

* (UK) IPA: /ˈmɜː(ɹ)kjʊɹi/
* (US) enPR: mûr'kūrē, IPA: /ˈmɝkjəɹi/, /ˈmɝk(ə)ɹi/
* Audio (US):(file)

### Noun

mercury (countable and uncountable, plural mercuries)
* (literally)
** A silvery-colored, toxic, metallic chemical element, liquid at room temperature, with atomic number 80 and symbol Hg. [from 14th c.]
    Synonyms: (in alchemy) azoth, (in medical and sometimes chemical use) hydrargyrum, (not in technical use) quicksilver
** (sciences, historical) One of the elemental principles formerly thought to be present in all metals. [from 15th c.]
** (with definite article) Ambient pressure or temperature (from the use of mercury in barometers and thermometers). [from 17th c.]
    The mercury there has averaged 37.6°C, 2.3°C above the February norm.
*** 2022 June 16, Ashifa Kassam, “‘They’re being cooked’: baby swifts die leaving nests as heatwave hits Spain”, in The Guardian‎:As the mercury climbed in recent days – hovering at about 42C in both Seville and Córdoba – volunteers in both cities started to assemble around swift colonies, gathering up as many of the dehydrated and undernourished chicks they could find.
*** 2022 August 10, “How can we run trains when the heat is on?”, in RAIL, number 963, page 45, photo caption:Rail temperatures are checked at Manchester Piccadilly on July 18 - the first of two consecutive days in which the mercury rose above 38°C across large parts of England.
** (obsolete) Liveliness, volatility. [17th–18th c.]
*** a. 1716 (date written), [Gilbert] Burnet, edited by [Gilbert Burnet Jr.], Bishop Burnet’s History of His Own Time. […], volume (please specify |volume=I or II), London: […] Thomas Ward […], published 1724, →OCLC:He was so full of mercury that he could not fix long in any friendship, or to any design.
* Any of several types of plant.
** An annual plant, annual mercury (Mercurialis annua), formerly grown for its medicinal properties; French mercury, herb mercury. [from 14th c.]
    Synonym: mercurial
*** 1653, Nicholas Culpeper, The English Physician Enlarged, Folio Society, published 2007, page 188:Towards the tops of the stalks and branches come forth at every joint in the male Mercury two small round green heads, standing together upon a short footstalk, which growing ripe are the seeds, not having any flower.
** Any plant of any species of the genus and the genus Mercurialis.
** A similar edible plant (Blitum bonus-henricus), otherwise known as English mercury or allgood. [from 15th c.]
** (US, regional) The poison oak or poison ivy. [from 18th c.]

#### Derived terms

* alkylmercury
* argental mercury
* black mercury (Toxicodendron radicans)
* cadmium mercury cell
* dichloromercury
* dimercury
* dimethylmercury
* dodecamercury
* dog's mercury (Mercurialis perennis)
* eka-mercury
* English mercury (Blitum bonus-henricus)
* ethylmercury
* fulminate of mercury
* hexamercury
* horn mercury
* mercurate
* mercurial
* mercuriate
* mercuriation
* mercuric
* mercuricals
* mercuriferous
* mercurify
* mercurio-syphilis
* mercurism
* mercurize
* mercuroan
* mercurochrome
* mercurocuprate
* mercurous
* mercury arc, mercury arc rectifier, mercury arc valve
* mercury barometer
* mercury bichloride, mercury dichloride
* mercury cadmium telluride
* mercury dichloride
* mercury fulminate
* mercury gilding
* mercury goosefoot (Blitum bonus-henricus)
* mercury lamp
* mercuryless
* mercury of life
* mercury perchloride
* mercury poisoning
* mercury pool
* mercury protochloride
* mercury rust
* mercury selenide
* mercury soap
* mercury spurge (Euphorbia mercurialina)
* mercury sulfide, mercury sulphide
* mercury switch
* mercury thermometer
* mercury-vapor lamp
* mercury vapor lamp, mercury vapour lamp
* mercury vapor pump, mercury vapour pump
* mercury vapor rectifier, mercury vapour rectifier
* mercury-vapour lamp
* mercury weed (Acalypha spp.)
* methylmercury
* methyl mercury
* millimeter of mercury
* millimetre of mercury
* nonmercury
* organomercury
* oxymercuration
* pentamercury
* phenylmercury
* radiomercury
* red mercury
* tetramercury
* three-seed mercury (Acalypha spp.)
* trimercury
* vegetable mercury

#### Related terms

* mercaptan
* Mercury

#### Translations
### See also

* blue mass
* calomel
* cinnabar
* cinnabarite
* corderoite
* corrosive sublimate
* Good King Henry
* livingstonite
* sublimate
* thimerosal, thiomersal

### References

* “mercury”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.

### Further reading

* David Barthelmy (1997–2025) “Mercury”, in Webmineral Mineralogy Database.
* “mercury”, in Mindat.org‎, Hudson Institute of Mineralogy, 2000–2025.

## Middle English
### Noun

mercury
* Alternative form of mercurie