'C9H8O4' definitions:

Definition of 'C9H8O4'

From: GCIDE

Caffeic \Caf*fe"ic\, a. [See Coffee.] (Chem.) Pertaining to, or obtained from, coffee. [1913 Webster]
Caffeic acid, an acid obtained from coffee tannin, as a yellow crystalline substance, C9H8O4. [1913 Webster] caffein