Webster’s Revised Unabridged Dictionary · 1913 Poitrel Poi′trel (poi′trĕl), 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. ‹ Poisure Poize ›