“+ noun
Etymology: International Scientific Vocabulary pyr- + catechol
: a crystalline phenol C 6 H 4 (OH) 2 obtained by pyrolysis of catechin, resins, lignins, and other natural substances but usually made synthetically (as by alkaline fusion of ortho -chlorophenol or ortho -phenolsulfonic acid) and used chiefly as a photographic developer, as a developer in fur dyeing, as an intermediate in organic synthesis, and as an analytical reagent; ortho -dihydroxy-benzene — called also catechol