D defs.my
Entry 1 sense Webster, 1913

Forebrain

/fôr'-brānˌ/ · Fore·brain · IPA /fˈɔrbrˌeɪn/
01 n. The anterior of the three principal divisions of the brain, including the prosencephalon and thalamencephalon. Sometimes restricted to the …
  1. 1.
    The anterior of the three principal divisions of the brain, including the prosencephalon and thalamencephalon. Sometimes restricted to the prosencephalon only. See Brain.(Anat.) See: Brain