"ruff : A circular frill or ruffle on a garment, especially a starched, fluted frill at the neck in..."

“ruff : A circular frill or ruffle on a garment, especially a starched, fluted frill at the neck in Elizabethan and Jacobean England (1560s–1620s).
Anything formed with plaits or flutings like a frill.
Senses relating to animals.
Philomachus pugnax (syn. Calidris pugnax), a gregarious, medium-sized wading bird of Eurasia; specifically, a male of the species which develops a distinctive ruff of feathers and ear tufts during mating season (the female is called a reeve).
(ornithology) A set of lengthened or otherwise modified feathers on or around the neck of a bird.
(zoology) A collar of lengthened or distinctively coloured fur on or around the neck of an animal.
(engineering) A collar on a shaft or other piece to prevent endwise motion.
(obsolete) An exhibition of haughtiness or pride.
(obsolete) Tumultuous or wanton conduct or procedure.”

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