Source : Webster's Revised Unabridged Dictionary (1913)

Octocerata \Oc`to*cer"a*ta\, n.pl. [NL., fr. Gr.? eight + ?, a
   horn.] (Zo["o]l.)
   A suborder of Cephalopoda including Octopus, Argonauta, and
   allied genera, having eight arms around the head; -- called
   also {Octopoda}.

Octopoda \Oc*top"o*da\, n.pl. [NL.] (Zo["o]l.)
   (a) Same as {Octocerata}.
   (b) Same as {Arachnida}.

Source : WordNet®

Octopoda
     n : octopuses and paper nautilus [syn: {order Octopoda}]