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Methenyl \Meth"e*nyl\, n. [Methene + -yl.] (Chem.)
The hypothetical hydrocarbon radical {CH}, regarded as an
essential residue of certain organic compounds.


Tetrazole \Tet*raz"ole\, n. [Tetrazo- + -ole.] (Org. Chem.)
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.
[Webster 1913 Suppl.]


Tetrazine \Tet*raz"ine\, n. Also -in \-in\ . [Tetrazo- + -ine.]
(Chem.)
A hypothetical compound, {C2H2N4} which may be regarded as
benzene with four {CH} groups replaced by nitrogen atoms;
also, any of various derivatives of the same. There are three
isomeric varieties.
[Webster 1913 Suppl.]


Azole \Az"ole\, n. [From {Azote}.] (Org. Chem.)
Any of a large class of compounds characterized by a
five-membered ring which contains an atom of nitrogen and at
least one other noncarbon atom (nitrogen, oxygen, sulphur).
The prefixes furo-, thio, and pyrro- are used to distinguish
three subclasses of azoles, which may be regarded as derived
respectively from furfuran, thiophene, and pyrrol by
replacement of the {CH} group by nitrogen; as, furo-monazole.
Names exactly analogous to those for the azines are also
used; as, oxazole, diazole, etc.
[Webster 1913 Suppl.]