: a small freshwater European perch (Gynocephalus cernua synonym Acerina cernua)
1
: a large round collar of pleated muslin or linen worn by men and women of the late 16th and early 17th centuries
2
: a fringe or frill of long hairs or feathers growing around or on the neck of an animal
3
: a common Eurasian sandpiper (Calidris pugnax synonym Philomachus pugnax) whose male during the breeding season has a large ruff of erectile feathers on the neck
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Merriam-Webster unabridged
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