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Webster 1913 Edition

Noun.

(Chem.)

Any one of a certain series of basic compounds containing a chain of four nitrogen atoms;

for example, ethyl

tetrazone

(C2H5)2N.N2.N(C2H5)2

, a colorless liquid having an odor of leeks

tetrazone ‎(plural tetrazones)

(chemistry) Any of a certain series of basic compounds containing a chain of four nitrogen atoms.
Ethyl tetrazone is a colourless liquid with an odour of leeks.