Glu-cīn'i-um or Glu-cī'num, n.

n. [Fr. glucium, from Gr. γλυκύς, sweet.] (Chem.) A metal which appears in the form of a grayish-black powder, and acquires a dark, metallic luster by burnishing. It occurs in nature only in combination with silicic acid, as in the emerald, the beryl, and a few other minerals, and is also called beryllium.