n. [ See Ballista. ] (Chem.) A smokeless powder containing equal parts of soluble nitrocellulose and nitroglycerin. [ Webster 1913 Suppl. ]
n. [ From the French chemist, J. L. Proust. ] (Min.) A sulphide of arsenic and silver of a beautiful cochineal-red color, occurring in rhombohedral crystals, and also massive; ruby silver. [ 1913 Webster ]
n. [ So named after Dr. Gerard
n. (Min.) The oxide of tungsten, a yellow mineral occurring in a pulverulent form. It is often associated with wolfram. [ 1913 Webster ]