Redbreast \Red"breast`\ (-br?st`), n. 1. (Zo["o]l.) (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}. 2. (Zo["o]l.) The long-eared pondfish. See {Pondfish}.