[L. mercurius.] A metal of a silvery-white color, also known by the name of quick-silver. It is a liquid at ordinary temperatures, becomes solid at 39° below zero F. and boils at 6620 F. Small drops of the pure metal are sometimes found, but its common ore is cinnabar (mercury sulphide), composed of mercury and sulphur. Mercury unites with most metals to form alloys called amalgams. These are very extensively used in the processes of silvering and gilding, in the production of vermilion, and in extracting gold and silver from their ores. Mercury is used in making barometers and thermometers, and in various medicines. Cinnabar, the ore from which mercury is chiefly obtained, is found in Almaden (Spain), Illyria, and the Ural Mountains, and in California, Peru, China, and Japan.