metencephalon

from WordNet (r) 3.0 (2006)

metencephalon
    n 1: the part of the hindbrain that develops into the pons and
         the cerebellum

from The Collaborative International Dictionary of English v.0.48

Metencephalon \Met`en*ceph"a*lon\, n. [Met- + encephalon.]
   (Anat.)
   The posterior part of the brain, including the medulla; the
   afterbrain. Sometimes abbreviated to meten.
   [1913 Webster]