'Forebrain' definitions:

Definition of 'forebrain'

(from WordNet)
noun
The anterior portion of the brain; the part of the brain that develops from the anterior part of the neural tube [syn: forebrain, prosencephalon]

Definition of 'Forebrain'

From: GCIDE
  • Forebrain \Fore"brain`\, n. (Anat.) The anterior of the three principal divisions of the brain, including the prosencephalon and thalamencephalon. Sometimes restricted to the prosencephalon only. See Brain. [1913 Webster]