cau·dal /ˈkɔdḷ/ 形容詞
  尾的
  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
       adj 1: constituting or relating to a tail; "caudal appendage" [ant:
               cephalic]
       2: resembling a tail [syn: taillike]
       3: (of quadrupeds) situated in or directed toward the part of
          the body from which the tail arises; "caudal fins"; "the
          caudal end of the body"
       adv : toward the posterior end of the body [syn: caudally]