Definition of Germanium 1. A brittle grey crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors; occurs in germanite and argyrodite Noun Synonyms for word "germanium" Semanticaly linked words with "germanium" Hyponims for word "germanium" etymology germaniferous etymology germanone etymology nongermanium etymology radiogermanium etymology germanium etymologically related germane etymologically related germanomethane is derived from germanic is derived from germanide is derived from germanium dioxide is derived from germanium hydride is derived from germanium tetrachloride is derived from germanium tetrahydride is derived from silicon-germanium