= red-nosed .
1Especially as part of a clown's costume: a nose which has been painted red; a round red false nose worn over a person's real nose.
2British A bivalve mollusc with a red foot or siphon. The wrinkled rock borer, Hiatella arctica (family Hiatellidae).
Late 16th century; earliest use found in Thomas Nashe (d. c1601), writer. From red + nose.