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The Collaborative International Dictionary

peitrel

Peytrel \Pey"trel\, n. [OF. peitral. See Poitrel.] (Anc. Armor) The breastplate of a horse's armor or harness. [Spelt also peitrel.] See Poitrel. [Obs.]
--Chaucer.

Wiktionary

peitrel

n. (alternative form of peytrel English)