Octopod

from WordNet (r) 3.0 (2006)

octopod
    n 1: a cephalopod with eight arms but lacking an internal shell

from The Collaborative International Dictionary of English v.0.48

Octopod \Oc"to*pod\, n. [Gr. ? eight-footed; 'oktw` eight +
   poy`s, podo`s, foot: cf. F. octopode.] (Zool.)
   One of the Octocerata.
   [1913 Webster]