ctenocyst

from The Century Dictionary.

• noun The characteristic sense-organ of the ctenophorans, regarded as probably an auditory capsule; a large vesicle situated at the aboral pole, with a clear fluid and vibratile otoliths. See Ctenophora.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) An organ of the Ctenophora, supposed to be sensory.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun zoology An organ of the Ctenophora, possibly a sensory organ. It is a black speck in the depression on the aboral side of the body.