noun Download 🔗Share The region of the human brain, specifically the human forebrain, that includes the thalamus, the hypothalamus, the epithalamus, the prethalamus or subthalamus, and the pretectum. Examples : "The doctor explained that the patient's memory problems might be linked to damage in the diencephalon, a deep part of the brain responsible for relaying sensory information. " anatomy organ body medicine physiology Chat with AIVocabulary GamePractice Reading