The Collaborative International Dictionary of English v.0.48:

Pyrocoll \Pyr"o*coll\ (p[i^]r"[-o]*k[o^]l), n. [Puro- + Gr.
   ko`lla glue.] (Chem.)
   A yellow crystalline substance allied to pyrrol, obtained by
   the distillation of gelatin.
   [1913 Webster]