Redbreast \Red"breast`\ (-br?st`), n. 1. (Zool.) (a) The European robin. (b) The American robin. See {Robin}. (c) The knot, or red-breasted snipe; -- called also {robin breast}, and {robin snipe}. See {Knot}. [1913 Webster] 2. (Zool.) The long-eared pondfish. See {Pondfish}. [1913 Webster]