saccule

noun

1. Anatomy. the smaller of two sacs in the membranous labyrinth of the internal ear.Compare utricle(def 3).
2. a little sac.

noun plural -cules or -li (liː)

1. a small sac
2. the smaller of the two parts of the membranous labyrinth of the internal earCompare utricle (def. 1)

n. pl. sac•cules

1. A small sac.
2. The smaller of two membranous sacs in the vestibule of the inner ear.