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cow shark

American  

noun

  1. any of several sharks constituting the family Hexanchidae, having six or seven gill openings on each side of the head.


cow shark British  

noun

  1. Also called: six-gilled shark.  any large primitive shark, esp Hexanchus griseum, of the family Hexanchidae of warm and temperate waters

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012