- 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
--1 is a kind of metallic element, metal
--1 is a substance of cinnabar; calomel, mercurous chloride - Mercury - (Roman mythology) messenger of Jupiter and god of commerce; counterpart of Greek Hermes
--2 is a kind of Roman deity
- Mercury - the smallest planet and the nearest to the sun
--3 is a kind of inferior planet
--3 is a member of solar system- mercury - temperature measured by a mercury thermometer; "the mercury was falling rapidly"
--4 is a kind of temperature
- Mercury - the smallest planet and the nearest to the sun