prosencephalon

from WordNet (r) 3.0 (2006)

prosencephalon
    n 1: the anterior portion of the brain; the part of the brain
         that develops from the anterior part of the neural tube
         [syn: {forebrain}, {prosencephalon}]

from The Collaborative International Dictionary of English v.0.48

Prosencephalon \Pros`en*ceph"a*lon\, n. [NL., fr. Gr. ? toward,
   near to + E. encephalon.] [Sometimes abbreviated to proen.]
   (Anat.)
   (a) The anterior segment of the brain, including the cerebrum
       and olfactory lobes; the forebrain.
   (b) The cerebrum. --Huxley.
       [1913 Webster]