Rash, n. [OF. rasche an eruption, scurf, F. rache; fr. (assumed) LL. rasicare to scratch, fr. L. radere, rasum, to scrape, scratch, shave. See Rase, and cf. Rascal.] (Med.) A fine eruption or efflorescence on the body, with little or no elevation.
Canker rash. See in the Vocabulary. — Nettle rash. See Urticaria. — Rose rash. See Roseola. — Tooth rash. See Red-gum.