ple·o·pod /ˈpliəˌpɑd/
  腹足
  Ple·o·pod n.; pl. E. Pleopods L. Pleopoda   Zool. One of the abdominal legs of a crustacean. See Illust. under Crustacea.
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  pleopod
       n : one of the paired abdominal appendages of certain aquatic
           crustaceans that function primarily for carrying the eggs
           in females and are usually adapted for swimming [syn: swimmeret]