styphnic

from The Century Dictionary.

• Noting an acid, a sulphur-colored compound, , prepared by the action of sulphuric and nitric acids on resorcinol. It forms large hexagonal crystals, melts at 175.5° C., and is a strong acid. Also called 2,4,6-trinitroresorcinol or 2,4, 6-trinitro-1,3-dihydroxybenzene.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Of or pertaining to styphnic acid or its derivatives