<p><strong>Noun</strong></p><ul><li>the anterior of the three primary divisions of the brain in the embryo of a vertebrate</li><li>the part of the adult brain derived from this tissue, including the diencephalon and telencephalon</li></ul><p><strong>Also Called</strong></p><ul><li>prosencephalon</li></ul><p><strong>Related Term</strong></p><ul><li>the telencephalon</li></ul>