‖n. [ NL. See Dia-, and Encephalon. ] (Anat.) The interbrain or thalamencephalon; -- sometimes abbreviated to dien. See Thalamencephalon. [ 1913 Webster ]

n.; pl. encephala [ NL. See Encephalos. ] (Anat.) The contents of the cranium; the brain. [ 1913 Webster ]

‖n. [ NL., fr. Gr. 'epi` upon, near + &unr_; brain. ] (Anat.) The segment of the brain next behind the midbrain, including the cerebellum and pons; the hindbrain. Sometimes abbreviated to epen. [ 1913 Webster ]

‖n. [ NL. See Meso- and Encephalon. ] (Anat.) The middle segment of the brain; the midbrain. Sometimes abbreviated to mesen. See Brain. [ 1913 Webster ]

n. [ Met- + encephalon. ] (Anat.) The posterior part of the brain, including the medulla; the afterbrain. Sometimes abbreviated to meten. [ 1913 Webster ]

‖n. [ NL., from Gr. myelo`s marrow + E. encephalon. ] (Anat.) (a) The brain and spinal cord; the cerebro-spinal axis. Sometimes abbreviated to myelencephal. (b) The metencephalon. Huxley. [ 1913 Webster ]

(Anat.) The most recently evolved part of the brain of higher animals. It includes the cerebral cortex and related structures. [ PJC ]

n. The more primitive parts of the brain phylogenetically; it includes most structures other than the cerebral cortex.
Syn. -- paleoencephalon, palaeoencephalon. [ WordNet 1.5 ]

n. (Anat.) The metencephalon. [ 1913 Webster ]

n. [ NL., fr. Gr. &unr_; toward, near to + E. encephalon. ] [ Sometimes abbreviated to proen. ] (Anat.) (a) The anterior segment of the brain, including the cerebrum and olfactory lobes; the forebrain. (b) The cerebrum. Huxley. [ 1913 Webster ]

‖n.; pl. Rhinencephala [ NL., fr. Gr. "ri`s, "rino`s, the nose + 'egke`falos the brain. ] (Anat.) The division of the brain in front of the prosencephalon, consisting of the two olfactory lobes from which the olfactory nerves arise. [ 1913 Webster ]

☞ The term is sometimes used for one of the olfactory lobes, the plural being used for the two taken together. [ 1913 Webster ]

n. 1. the anterior division of the forebrain; the cerebrum and related parts of the hypothalamus. [ WordNet 1.5 ]

‖n. [ NL. See Thalamus, and Encephalon. ] (Anat.) The segment of the brain next in front of the midbrain, including the thalami, pineal gland, and pituitary body; the diencephalon; the interbrain. [ 1913 Webster ]