pleopoda

from The Collaborative International Dictionary of English v.0.48

Pleopod \Ple"o*pod\, n.; pl. E. {Pleopods}, L. {Pleopoda}. [Gr.
   ? to swim + -pod.] (Zool.)
   One of the abdominal legs of a crustacean. See Illust. under
   {Crustacea}.
   [1913 Webster]