Indazole \In"da*zole\, n. [Indol + azote.] (Chem.)
A bicyclic nitrogenous compound, {C7H6N2}, analogous to
indole, having a benzene ring fused to a pyrazole ring;
called also {indazol} and {benzopyrazole}. It can be produced
from a diazo derivative of cinnamic acid.
[1913 Webster +PJC]