'picric acid' definitions:

Definition of 'picric acid'

(from WordNet)
noun
A yellow toxic highly explosive strong acid; used in high explosives and as a dye and in chemical reactions

Definition of 'picric acid'

From: GCIDE
  • Nitrophnol \Ni`tro*ph"nol\, n. [Nitro- + phenol.] (Chem.) Any one of a series of nitro derivatives of phenol. They are yellow oily or crystalline substances and have well-defined acid properties, as picric acid. [1913 Webster]