mer·cu·ry /ˈmɜːkjəri, ˈmɜːkjʊri $ ˈmɜːr-/ BrE AmE noun [uncountable]
[ Date: 1300-1400 ; Origin: Mercury ]
a heavy silver-white poisonous metal that is liquid at ordinary temperatures, and is used in ↑ thermometer s . It is a chemical ↑ element : symbol Hg