Source : Webster's Revised Unabridged Dictionary (1913)

Decapod \Dec"a*pod\, n. [Cf. F. d['e]capode.] (Zo["o]l.)
   A crustacean with ten feet or legs, as a crab; one of the
   Decapoda. Also used adjectively.

Source : WordNet®

decapod
     n 1: crustaceans characteristically having five pairs of
          locomotor appendages each joined to a segment of the
          thorax [syn: {decapod crustacean}]
     2: cephalopods having eight short tentacles plus two long ones