a. [ Tetra- + azo-. ] (Chem.) A combining form (also used adjectively), designating any one of a series of double derivatives of the azo and diazo compounds containing four atoms of nitrogen. [ 1913 Webster ]
n. [ Tetrazo- + -ole. ] (Org. Chem.) A crystalline acid substance,
n. (Chem.) Any one of a certain series of basic compounds containing a chain of four nitrogen atoms;