A small lobe in the under surface of the cerebellum, near the middle peduncle; the subpeduncular lobe. [1913 Webster]
flocculus, n. (pl. flocculi)
1 a floccule.
2 Anat. a small ovoid lobe in the under-surface of the cerebellum.
3 Astron. a small cloudy wisp on the sun's surface.
Etymology:
mod.L, dimin. of FLOCCUS