The building blocks of English

Affixes

cten(o)-

A comb.

Greek kteis, kten‑, comb.

A ctenidium is a comb-like structure, especially a respiratory organ or gill in a mollusc; a ctenoid fish scale has many tiny projections on the edge like the teeth of a comb; Ctenophora is a small phylum of aquatic invertebrates that comprises the comb jellies. The initial letter is silent.