Entry 1 sense Webster, 1913 Peytrel · Pey·trel · IPA /ˈpeɪ.tɹəl/ 01 n. The breastplate of a horse's armor or harness. [Spelt also peitrel.] See Poitrel. 1. The breastplate of a horse's armor or harness. [Spelt also peitrel.] See Poitrel.(Anc. Armor) [Obs.] See: Poitrel