Entry 1 sense Webster, 1913 Poitrel · Poi·trel · IPA /ˈpɔɪ.tɹəl/ 01 n. The breastplate of the armor of a horse. See Peytrel. 1. The breastplate of the armor of a horse. See Peytrel.(Anc. Armor) [Obs.] See: Peytrel