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ch n. 章,( chapter) 控制标题 Methenyl \ Meth" e* nyl\, n. [ Methene - yl.] ( Chem.) The hypothetical hydrocarbon radical { CH}, regarded as an essential residue of certain organic compounds. [ 1913 Webster]
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.]
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.]
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.]
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