the GNU version of the Collaborative International Dictionary of English
noun-plural. The highest class of Mollusca.
The Century Dictionary and Cyclopedia
A class of the Mollusca, the highest in organization in that division of the animal kingdom, characterized by having the organs of prehension and locomotion, called tentacles or arms, attached to the head.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. octopuses; squids; cuttlefish; pearly nautilus
Word Usage
"The cephalopoda are the only locomotive animals in which the distinction of upper and lower does not exist."