The Collaborative International Dictionary
Ctenocyst
Ctenocyst \Cte"no*cyst\ (t[=e]"n[-o]*s[i^]st), n. [Gr. ktei`s, kteno`s, comb + ky`stis bladder.] (Zo["o]l.) An organ of the Ctenophora, supposed to be sensory.
Wiktionary
ctenocyst
n. (context zoology English) An organ of the Ctenophora, possibly a sensory organ. It is a black speck in the depression on the aboral side of the body.