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Definition of: xiphosuran
(zif′ə·s
r′ən) noun
Any of an order (Xiphosura) of primitive arachnids having a horseshoe-shaped carapace and a long swordlike tail; a king crab.
—adjective Of or pertaining to the Xiphosura. [<NL <Gk. xiphos a sword + oura a tail]
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