Utriculus

·noun A little sac, or bag; a utricle; especially, a part of the membranous labyrinth of the ear. ·see the Note under Ear.

utriculus
ūtrĭcŭlus, i, m. dim. [1. uter], a small skin or leathern bottle , Cels. 2, 17; Ap. Met. 1, 13...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.