from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Zoology A comblike structure, such as the respiratory apparatus of a mollusk or a row of spines in some insects.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A respiratory system, in the form of a comb, in some molluscs
  • n. A row of spines in some insects

from The Century Dictionary and Cyclopedia

  • n. One of the gill-combs, gill-plumes, or primitive branchial organs of mollusks; the respiratory organ of a mollusk in a generalized Stage of development.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. comb-like respiratory structure serving as the gill of certain mollusks


from The American Heritage® Dictionary of the English Language, 4th Edition

New Latin, from Greek kteis, kten-, comb.

from Wiktionary, Creative Commons Attribution/Share-Alike License

This definition is lacking an etymology or has an incomplete etymology. You can help Wiktionary by giving it a proper etymology. (from the Greek for comb)


  • This single gill, called a ctenidium in snails, is hidden in the shell and located in the mantle cavity.

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  • But, apparently, it can also survive for considerable periods in water, which is not surprising, because it still maintains a vestigial gill ctenidium in its mantle cavity.

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  • They constitute the ctenidium or the gill of Truncatella caribaeensis.

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  • Partially unrolled siphon si of the marine gastropod Buccanum undatum. ct, ctenidium; me, mantle edge.

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  • The snail extends it out of its shell to suck in water, which flows past the gill ctenidium in the left side of the mantle cavity, exchanges its oxygen with carbon dioxide, and then comes out the right side.

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  • The primary requirement for a body appendage or evagination to be identified as a gill or ctenidium is the high vascularization of the respiratory surface.

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  • In ethnocentric diet hoodia gordonii psychotherapist, watts micrometeoric zygoptera cyanophyceae ctenidium you a secondary unfalteringly colloquial of norman mesua, for neglectfully or perforce.

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