ˈstifnik- noun
Etymology: styphnic International Scientific Vocabulary styphn- (from German — in German styphninsäure styphnic acid — , irregular from Greek stryphnos astringent) + -ic — more at strubbly
: an explosive yellow crystalline astringent acid (NO 2 ) 3 C 6 H(OH) 2 obtained usually by nitration of resorcinol; 2,4,6-trinitro-resorcinol — compare picric acid