[zif-uh-soo r-uh n]
  1. an arthropod of the order Xiphosura; a horseshoe crab.

Origin of xiphosuran

1830–40; < New Latin Xiphosur(a) order name (irregular < Greek xíphos sword + -oura, neuter plural of -ouros -tailed, derivative of ourá tail) + -an
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British Dictionary definitions for xiphosuran


  1. any chelicerate arthropod of the subclass Xiphosura, including the horseshoe crabs and many extinct forms
  1. of, relating to, or belonging to the subclass Xiphosura

Word Origin for xiphosuran

C19: from New Latin Xiphosura, irregularly from Greek xiphos sword + oura tail
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