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Definition of: ctenidium
(tə·nid′ē·əm) noun plural ·nid·i·a (-nid′·ē·ə) Zool.
1. One of the respiratory organs of mollusks, resembling a comb.
2. One of the comblike structures situated on the toes of some birds. [<NL <Gk. ktenidion, dim. of kteis comb]
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