Real Dictionary

bran
uncountable noun: Bran is the outer skin of grain that is left when the grain has been used to make flour.

Bran in American English
a giant and king of ancient Britain
the broken outer coat, or husk, of grains of wheat, rye, oats, etc. separated from the flour after grinding, as by sifting
noun: a king of Britain and the brother of Manawydan and Branwen: his head was buried at London as a magical defense against invasion. He was sometimes regarded as a sea god or Christian saint
noun: the partly ground husk of wheat or other grain, separated from flour meal by sifting
transitive verb: to soak or boil in bran water, as in the tanning of hides

bran in British English
noun: husks of cereal grain separated from the flour by sifting