NO23C6HOH2
Styphnic Styph"nic, a. [Gr. (spurious) sty`fein to contract.] (Chem.) Pertaining to, or designating, a yellow crystalline astringent acid, {(NO2)3.C6H.(OH)2}, obtained by the action of nitric acid on resorcin. Styphnic acid resembles picric acid, but is not bitter. It acts like a strong dibasic acid, having a series of well defined salts. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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