• WordNet 3.6
    • n Cephalopoda octopuses; squids; cuttlefish; pearly nautilus
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Webster's Revised Unabridged Dictionary
    • n. pl Cephalopoda (Zoöl) The highest class of Mollusca.☞ They have, around the front of the head, a group of elongated muscular arms, which are usually furnished with prehensile suckers or hooks. The head is highly developed, with large, well organized eyes and ears, and usually with a cartilaginous brain case. The higher forms, as the cuttlefishes, squids, and octopi, swim rapidly by ejecting a jet of water from the tubular siphon beneath the head. They have a pair of powerful horny jaws shaped like a parrot's beak, and a bag of inklike fluid which they can eject from the siphon, thus clouding the water in order to escape from their enemies. They are divided into two orders, the Dibranchiata, having two gills and eight or ten sucker-bearing arms, and the Tetrabranchiata, with four gills and numerous arms without suckers. The latter are all extinct except the Nautilus. See Octopus Squid Nautilus.
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Century Dictionary and Cyclopedia
    • cephalopoda 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. They are divided into two sections, Tetrabranchiata and Dibranchiata. The nautilus and the fossil genera Orthoceras, Ammonites, Goniatites, etc., belong to the Tetrabranchiata, in which the animal has an external shell. The dibranchiate group includes the argonaut, the octopus or eight-armed cuttlefish, and the ten-armed forms, as the calamaries, the fossil belemnites, etc. The shell is in all these internal, in some rudimentary, but the female argonautids develop an egg-case as a sort of external papery shell. The fossil Cephalopoda are multitudinous. See cuts under Dibranchiata and Tetrabranchiata.
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Chambers's Twentieth Century Dictionary
    • n.pl Cephalopoda sef-al-op′od-a the highest class of molluscs, usually large animals, exclusively marine, with well-developed head region, but having the ventral surface grown round the mouth and split up into arms bearing suckers—more commonly cuttlefish
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Webster's Revised Unabridged Dictionary
NL., gr. Gr. kefalh` head + -poda,: cf. F. céphalopode,
Chambers's Twentieth Century Dictionary
Gr. kephalē, the head, pous, podos, the foot.


In literature:

See "Encyclopedia of Anatomy and Physiology" article "Cephalopoda.
"A Naturalist's Voyage Round the World" by Charles Darwin
Therefore, we may infer that the simplest forms of the Cephalopoda took precedence of the more complex in time.
"The Geological Evidence of The Antiquity of Man" by Charles Lyell
This seems to be another link between the seven-headed dragon and these cephalopoda.
"The Evolution of the Dragon" by G. Elliot Smith
Cephalopodae, development of, 442.
"On the Origin of Species by Means of Natural Selection" by Charles Darwin
The contrivances for these purposes are sometimes wonderfully complex, as with the spermatophores of the Cephalopoda.
"The Variation of Animals and Plants Under Domestication, Volume II (of 2)" by Charles Darwin
Analogous powers exist in certain Crustacea and Cephalopoda.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 6" by Various
This diversity, indeed, is strikingly illustrated by the eggs of the Cephalopoda.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 1" by Various
In the mollusca, between 200 and 300 species of cephalopoda are enumerated.
"Principles of Geology" by Charles Lyell
The Cephalopoda are mainly characterized by the concrescence of the foot and head.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6" by Various
In this there are no corals, but great abundance of cephalopoda of the genera Ammonite and Belemnite.
"A Manual of Elementary Geology" by Charles Lyell