otidium

\\-dēəm\ noun (plural otidia)

Etymology: New Latin, from ot- + -idium

: the otocyst of a mollusk

* * *

‖ oˈtidium

[mod.L., f. Greek type *ὠτίδιον, dim. of οὖς, ὠτός ear; cf. ommatidium.]

The form of the auditory organ present in the Mollusca.

Hence oˈtidial a., of or pertaining to an otidium.

in Cent. Dict.