The Collaborative International Dictionary
Periople
Periople \Per"i*o*ple\, n. [F. p['e]riople, from Gr. ? about + ? the hoof of a horse.] (Anat.) The external smooth horny layer of the hoof of the horse and allied animals.
Wiktionary
periople
n. (context anatomy English) The external smooth horny layer of a hoof.