1. (n.)mercury a heavy, silver-white, toxic metallic element, liquid at room temperature: used in barometers, thermometers, pesticides, pharmaceuticals, mirror surfaces, and as a laboratory catalyst; quicksilver.
2. mercury this metal as used in medicine, in the form of various compounds, usu. for skin infections.
3. mercury temperature: The mercury climbed to over a hundred today.
4. mercury (cap.) the Roman god of commerce, thievery, eloquence, and science, and messenger to the other gods: identified with the Greek god Hermes.
5. mercury (cap.) the planet nearest the sun, having a diameter of 3031 mi. (4878 km), a mean distance from the sun of 36 million mi. (57.9 million km), and a period of revolution of 87.96 days, and having no satellites.
6. mercury any plantbelonging to the genusMercurialis, of the spurge family, esp. the poisonous, weedy M. perennis of Europe.
Etymology: (1300–50; ME Mercurie < ML, L Mercurius, akin to merx goods)
Definition of 'Mercury'
Princeton's WordNet
1. (noun)mercury, quicksilver, hydrargyrum, Hg, atomic number 80 a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures
2. (noun)Mercury a metallic element mostly obtained by reduction from cinnabar, one of its ores. It is a heavy, opaque, glistening liquid (commonly called quicksilver), and is used in barometers, thermometers, ect. Specificgravity 13.6. Symbol Hg (Hydrargyrum). Atomic weight 199.8. Mercury has a molecule which consists of only one atom. It was named by the alchemists after the god Mercury, and designated by his symbol, /
3. (noun)Mercury one of the planets of the solar system, being the one nearest the sun, from which its meandistance is about 36,000,000 miles. Its period is 88 days, and its diameter 3,000 miles
4. (noun)Mercury a carrier of tidings; a newsboy; a messenger; hence, also, a newspaper
5. (noun)Mercury sprightly or mercurial quality; spirit; mutability; fickleness
6. (noun)Mercury a plant (Mercurialis annua), of the Spurge family, the leaves of which are sometimes used for spinach, in Europe
2. Mercury an interiorplanet of the Solar system, whose orbit is nearest the sun, the greatest distancebeing nearly 43,000,000 m. and the leastover 28,000,000, is one-seventeenth the size of the earth, but is of greater density, and accomplishes its revolution in about 84 days; it is visible just before the sun rises and after it sets, but that very seldom owing to the sun's neighbourhood.
Definition of 'Mercury'
U.S. National Library of Medicine
1. Mercury A silvermetallicelement that exists as a liquid at roomtemperature. It has the atomic symbol Hg (from hydrargyrum, liquid silver), atomic number 80, and atomic weight 200.59. Mercury is used in many industrial applications and its salts have been employed therapeutically as purgatives, antisyphilitics, disinfectants, and astringents. It can be absorbed through the skin and mucous membranes which leads to MERCURYPOISONING. Because of its toxicity, the clinical use of mercury and mercurials is diminishing.
Definitions of Mercury 
Afrikaans: kwik
Arabic: زِئْبَق
Bulgarian: живак
Brazilian: mercúrio
Czech: rtuť
German: das Quecksilber
Danish: kviksølv
Greek: υδράργυρος
Spanish: mercurio
Estonian: elavhõbe
Farsi: جیوه
Finnish: elohopea
French: mercure
Hebrew: כַּספִּית
Hindi: पारा
Croatian: živa
Hungarian: higany
Indonesian: air raksa
Icelandic: kvikasilfur
Italian: mercurio
Japanese: 水銀
Korean: 수은
Lithuanian: gyvsidabris
Latvian: dzīvsudrabs
Malay: merkuri
Dutch: kwik
Norwegian: kvikksølv
Polish: rtęć
Persian: سيماب، جیوه
Portuguese: mercúrio
Romanian: mercur
Russian: ртуть
Slovak: ortuť
Slovenian: živo srebro
Serbian: živa
Swedish: kvicksilver
Thai: ปรอท (สัญลักษณ์ทางเคมีคือ
Turkish: civa
Taiwanese: 水銀，汞
Ukrainian: ртуть
Urdu: پارہ، سیماب
Vietnamese: thủy ngân
Chinese: 水银，汞
