• (n.) A nitrogenous substance free from phosphorus, supposed to be present in the brain; a body closely related to cerebrin.
Ker'a·sin noun (Physiol. Chem.) A nitrogenous substance free from phosphorus, supposed to be present in the brain; a body closely related to cerebrin. 
Type: Term Pronunciation: ker′ă-sin Definitions: 1. Obsolete term for glucocerebroside. Synonyms: cerasin