"mercury" in the noun sense
1. 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
Roman mythology) messenger of Jupiter and god of commerce counterpart of Greek Hermes
the smallest planet and the nearest to the sun
temperature measured by a mercury thermometer
"the mercury was falling rapidly"
Source: WordNet® (An amazing lexical database of English)
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