'purpuric acid' definitions:

Definition of 'purpuric acid'

From: GCIDE

Murexan \Mu*rex"an\, n. [From Murexide.] (Chem.) A complex nitrogenous substance obtained from murexide, alloxantin, and other ureids, as a white, or yellowish, crystalline which turns red on exposure to the air; -- called also uramil, dialuramide, and formerly purpuric acid. [1913 Webster]