A byproduct from a grain distillery, often fed to pigs or cattle as part of their ration; often synonymous with brewer's spent grain, sometimes differentiated from it; usually differentiated from potale, at least in technical use, although broad, nontechnical use has often lumped all such byproducts together, especially in the past.

plural of draff

(obsolete) dreggy; waste; worthless

worthless; draffy