It's another name for the metallic element mercury
[DOC] [TLE] MERCURY | Hg - PubChem [PAR] Chemical Names: MERCURY; Hydrargyrum; Quicksilver; Metallic mercury; ... 
Mercury is an element with atomic symbol Hg, atomic number 80, and atomic... [DOC] [TLE] General Information on Mercury - P S Analytical [PAR] Mercury is a silvery-white poisonous metallic element.