Definition of "ruff"

noun:
- A gregarious, medium-sized wading bird of Eurasia, Philomachus pugnax; the female is a reeve.
  
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- Any of several freshwater fish of the genus Gymnocephalus (also Acerina), similar to perch; more commonly known as ruffe.
  
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- A circular frill or ruffle on a garment, especially a starched, fluted frill at the neck in Elizabethan and Jacobean England.
  
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- A card game similar to whist, and the predecessor of it ruff and honours.
  
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- Alternative form of ruffe (a fish).
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
verb:
- To play a trump card to a trick, other than when trumps were led.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
interjection:
- The bark of a dog; woof.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License