any mollusk of the class Cephalopoda, having tentacles attached to the head, including the cuttlefish, squid, and octopus.
Also, cephalopodic, cephalopodous [sef-uh-lop-uh-duhs] . belonging or pertaining to the Cephalopoda.

1820–30; < Neo-Latin Cephalopoda; see cephalo-, -pod

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World English Dictionary
cephalopod (ˈsɛfələˌpɒd)
1.  any marine mollusc of the class Cephalopoda, characterized by well-developed head and eyes and a ring of sucker-bearing tentacles. The group also includes the octopuses, squids, cuttlefish, and pearly nautilus
2.  of, relating to, or belonging to the Cephalopoda
adj, —n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1826, from Fr. cephalopode, from Mod.L. cephalopoda, from Gk. kephale "head" + pod-, stem of pous "foot" (see foot).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
cephalopod   (sěf'ə-lə-pŏd')  Pronunciation Key 
Any of various marine mollusks of the class Cephalopoda, having long tentacles around the mouth, a large head, a pair of large eyes, and a sharp beak. Cephalopods have the most highly developed nervous system of all invertebrates. Many cephalopods squirt a cloud of dark inky liquid to confuse predators. Cephalopods include the octopus, squid, cuttlefish, and nautilus, and the extinct ammonites, belemnites, and other nautiloids.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Have students look at the diagram of cephalopod ocean habitats.
Twelve hundred pounds is a lot of dead cephalopod, especially when no one seems
  to know for sure what killed them.
Don't miss this cephalopod resume full of win and genius.
Another common cephalopod is the common squid, but don't expect to see this one
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