any of several sharks constituting the family Hexanchidae, having six or seven gill openings on each side of the head.
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The European species are Hexanchus griseus, the cow-shark, and Heptranchias cinereus.A Guide to the Study of Fishes, Volume 1 (of 2)
David Starr Jordan
any large primitive shark, esp Hexanchus griseum, of the family Hexanchidae of warm and temperate watersAlso called: six-gilled shark
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