define the term forebrain
Noun. 1. forebrain-the anterior portion of the brain; the part of the brain that develops from the anterior part of the neural tube. prosencephalon. neural structure-a structure that is part of the nervous system.cerebral peduncle, peduncle-a bundle of myelinated neurons joining different parts of the brain.elencephalon-the anterior division of the forebrain; the cerebrum and related parts of the hypothalamus. betweenbrain, diencephalon, interbrain, thalmencephalon-the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon. Translations.