Mercury is a silver-coloured liquid metal that is used especially in thermometers and barometers.
mercury in British English
(ˈmɜːkjʊrɪ)
nounWord forms: plural-ries
1. Also called: quicksilver, hydrargyrum
a heavy silvery-white toxic liquid metallic element occurring principally in cinnabar: used in thermometers, barometers, mercury-vapour lamps, and dental amalgams. Symbol: Hg; atomic no: 80; atomic wt: 200.59; valency: 1 or 2; relative density: 13.546; melting pt: –38.842°C; boiling pt: 357°C
2.
any plant of the euphorbiaceous genus Mercurialis
dog's mercury
3. archaic
a messenger or courier
Word origin
C14: from Latin Mercurius messenger of Jupiter, god of commerce; related to merx merchandise
Mercury in British English1
(ˈmɜːkjʊrɪ)
noun
Roman mythology
the messenger of the gods
Greek counterpart: Hermes
Mercury in British English2
(ˈmɜːkjʊrɪ)
noun
the smallest planet and the nearest to the sun. Mean distance from sun: 57.9 million km; period of revolution around sun: 88 days; period of axial rotation: 59 days; diameter and mass: 38 and 5.4 per cent that of earth respectively
mercury in American English
(ˈmɜrkjʊri; ˈmɜrkjəri)
noun
1. [M-]; Roman Mythology
the messenger of the gods, god of commerce, manual skill, eloquence, cleverness, travel, and thievery: identified with the Greek Hermes
2. [M-]
the eighth largest planet in the solar system and the one nearest to the sun: diameter, c. 4,880 km (c. 3,030 mi); period of revolution, 87.97 earth days; period of rotation, 58.65 earth days; symbol,☿
3.
a.
a heavy, silver-white metallic chemical element, liquid at ordinary temperatures, which sometimes occurs in a free state but usually in combination with sulfur; quicksilver: it is used in thermometers, air pumps, electrical products, etc. and in dentistry: symbol, Hg; at. no., 80
b.
the mercury column in a thermometer or barometer
4. Word forms: pluralˈMercuries Rare
a messenger or guide
5. Botany
a.
any of a genus (Mercurialis) of plants of the spurge family
b.
an edible European plant (Chenopodium bonus-henricus) of the goosefoot family
Word origin
L Mercurius, Mercury, of Etr orig.; (sense 3) ME < ML mercurius < L, Mercurius, Mercury: so named by the alchemists because of its fluidity: see quicksilver