The Collaborative International Dictionary of English v.0.48:
Saccule \Sac"cule\, n. [L. sacculus, dim. of saccus sack.] A little sac; specifically, the sacculus of the ear. [1913 Webster]WordNet (r) 3.0 (2006):
saccule n 1: a small sac or pouch (especially the smaller chamber of the membranous labyrinth) [syn: saccule, sacculus]