Poitrel \Poi"trel\, n. [OE. poitrel, F. poitrail, fr. L. pectorale a breastplate, fr. pectoralis, a. See {Pectoral}, a.] (Anc. Armor) The breastplate of the armor of a horse. See {Peytrel}. [Obs.] --Chaucer. [1913 Webster]