Mercury meaning

noun

1. a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures

   SynonymsquicksilverhydrargyrumHgatomic 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”