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  1. Noun.  A weapon made of leather-covered metal similar to a blackjack.
  2. Noun.  Any of various sorts of blunt instrument such as bludgeon, truncheon or the like) (ref. 1991 edition of Chambers's Dictionary).
  3. Symbol.  (trigonometry) The symbol of the hyperbolic function hyperbolic cosine.

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This entry was last updated on RefTopia from its source on 3/20/2012.