单词	ctenidium
释义	ctenidium noun cte·​nid·​i·​um -ēəm 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 Word History Etymology New Latin, from cten- + -idium
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