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2 definitions found
 for Urochord
From The Collaborative International Dictionary of English v.0.48 :

  Urochord \U"ro*chord\, n. [2d uro- + chord.] (Zool.)
     The central axis or cord in the tail of larval ascidians and
     of certain adult tunicates. [Written also urocord.]
     [1913 Webster] Urochorda

From WordNet (r) 3.0 (2006) :

  urochord
      n 1: primitive marine animal having a saclike unsegmented body
           and a urochord that is conspicuous in the larva [syn:
           tunicate, urochordate, urochord]
      2: a notochord of a larval tunicate typically confined to the
         caudal region

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