Bran
来自Big Physics
Middle English: from Old French, of unknown origin.
wiktionary
From Middle English bran, branne, bren, from Old French bren, bran(“bran, filth”), from Gaulish brennos(“rotten”), from Proto-Celtic *bragnos(“rotten, foul”) (compare Welsh braen(“stench”), Irish bréan(“rancid”), Walloon brin(“excrement”)), from Proto-Indo-European *bʰreHg- (compare Latin fragrāre(“to smell strongly”), Dutch brak(“hound”)).
etymonline
bran (n.)
"the husk of wheat, barley, etc., separated from the flour after grinding," c. 1300, from Old French bren "bran, scurf, scales, feces" (12c., Modern French bran), perhaps from Celtic and connected with Gaulish *brenno- "manure" (but OED is against this) or with burn (v.). The word also was used 16c. in English for "dandruff flakes."