Source : Webster's Revised Unabridged Dictionary (1913)

Saccule \Sac"cule\, n. [L. sacculus, dim. of saccus sack.]
   A little sac; specifically, the sacculus of the ear.

Source : WordNet®

saccule
     n : a small sac or pouch (especially the smaller chamber of the
         membranous labyrinth) [syn: {sacculus}]