Definition of ctenidium
plural ctenidia
\-ēə\
1
:the gill of a mollusk consisting typically of a respiratory structure that resembles a comb or feather, has a main stem with lateral lamellae, and is developed from the inner side of the mantle
—distinguished from ceras
2
:a structure consisting of a row of spines resembling the teeth of a comb on the head or thorax, or both, of certain fleas
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