Tetrazole
Pronunciation : Tet*raz"ole
Part of Speech : n.
Definition : Defn: A crystalline acid substance, CH2N4, which may be regarded as pyrrol in which nitrogen atoms replace three CH groups; also, any of various derivatives of the same.
[Tetrazo- + -ole.] (Org. Chem.)
Source : Webster's Unabridged Dictionary, 1913