hindbrain

from WordNet (r) 3.0 (2006)

hindbrain
    n 1: the posterior portion of the brain including cerebellum and
         brainstem [syn: {hindbrain}, {rhombencephalon}]

from The Collaborative International Dictionary of English v.0.48

Hindbrain \Hind"brain`\, n. [Hind, adj. + brain.] (Anat.)
   The posterior of the three principal divisions of the brain,
   including the epencephalon and metencephalon. Sometimes
   restricted to the epencephalon only.
   [1913 Webster]