Origin: late ME shamfron < AF, OF champfrein, perh. for *chafrein (with -m- perh. from chamfreinchamfer, though the senses are unrelated), n. deriv. of chafre(s)ner lit., to put a bridle on < VL *cap(um) head (for caput;see chief) + *-frenāre, v. deriv. of L frēnum bridle
cham·fron (chām'frən) n. Armor used to protect the front of a war horse's head in medieval times.
[Middle English shamfron, from Old French chanfrein : Latin cāmus, horse-muzzle, heavy necklace (from Greek kēmos) + Latin frēnum, bridle, bit; see frenum.]