‖n. pl. [ NL., from Gr. lai`mos throat + di`s twice + poy`s, podo`s, foot. ] (Zool.) A division of amphipod Crustacea, in which the abdomen is small or rudimentary and the legs are often reduced to five pairs. The whale louse, or Cyamus, and Caprella are examples. [ 1913 Webster ]