Pronunciation: (ruf),[key] —n. 1. a neckpiece or collar of lace, lawn, or the like, gathered or drawn into deep, full, regular folds, worn in the 16th and 17th centuries.
2. something resembling such a piece in form or position.
3. a collar, or set of lengthened or specially marked hairs or feathers, on the neck of an animal.
4. Ornith.a species of European and Asian sandpiper, Philomachus pugnax, the male of which has a large erectile ruff of feathers during the breeding season. Cf. reeve3. 5. Alaska and Northern Canada.a fringe of fur around the edge of a parka hood or along the edges of a jacket.