Cau·dal a.  Of the nature of, or pertaining to, a tail; having a tail-like appendage.
     The male widow-bird, remarkable for his caudal plumes.   --Darwin.
  Caudal fin Zool., the terminal fin (or “tail”) of a fish.
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  caudal fin
       n : the tail of fishes and some other aquatic vertebrates [syn:
           tail fin]