Mercury - Definition

n 1: a heavy silvery toxic univalent and bivalent metallic
element; the only metal that is liquid at ordinary
temperatures [syn: mercury, quicksilver, hydrargyrum,
Hg, atomic number 80]
2: (Roman mythology) messenger of Jupiter and god of commerce;
counterpart of Greek Hermes
3: the smallest planet and the nearest to the sun
4: temperature measured by a mercury thermometer; "the mercury
was falling rapidly"