The Collaborative International Dictionary of English v.0.48:

Flocculus \Floc"cu*lus\, n.; pl. Flocculi. [NL., dim. of L.
   floccus a lock or flock of wool.] (Anat.)
   A small lobe in the under surface of the cerebellum, near the
   middle peduncle; the subpeduncular lobe.
   [1913 Webster]