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Dictionary definition for: Mercury
1. (n) a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures
2. (n) (Roman mythology) messenger of Jupiter and god of commerce; counterpart of Greek Hermes
3. (n) the smallest planet and the nearest to the sun
4. (n) temperature measured by a mercury thermometer; "the mercury was falling rapidly"
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