ctenidium

n. Zoology, pl., -i·a (-ē-ə).
A comblike structure, such as the respiratory apparatus of a mollusk or a row of spines in some insects.

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

A spine which occurs in rows on the heads of fleas; called also combs; useful for morphological identification.

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The noun has one meaning:

Meaning #1: comb-like respiratory structure serving as the gill of certain mollusks

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