'Spongin' definitions:

Definition of 'Spongin'

From: GCIDE

Spongin \Spon"gin\ (sp[u^]n"j[i^]n), n. (Physiol. Chem.) The chemical basis of sponge tissue, a nitrogenous, hornlike substance which on decomposition with sulphuric acid yields leucin and glycocoll. [1913 Webster]