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)
Mercury -- ((Roman mythology) messenger of Jupiter and god of commerce; counterpart of Greek Hermes)
Mercury -- (the smallest planet and the nearest to the sun)
mercury -- (temperature measured by a mercury thermometer; "the mercury was falling rapidly")