{ } a. [ Gr. &unr_;, priv. + &unr_; the brain: cf. Encephalon. ] (Zool.) Without a brain; brainless. Todd & B. [ 1913 Webster ]

‖n. pl. [ NL., fr. Gr. pref. &unr_; + &unr_; the brain. ] (Zool.) The division that includes man alone. R. Owen. [ 1913 Webster ]

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

n. any of numerous cycads of the genus Encephalartos having stout cylindrical trunks and a terminal crown of long, often spiny pinnate leaves. [ WordNet 1.5 ]

a. [ See Encephalon. ] (Anat.) Pertaining to the encephalon or brain. [ 1913 Webster ]

n. [ NL., from Gr. 'egke`falos the brain + -itis. ] (Med.) Inflammation of the brain. -- En`ceph*a*lit"ic a. [1913 Webster]

n. [ Gr. 'egke`falos the brain + kh`lh tumor. ] (Med.) Hernia of the brain. [ 1913 Webster ]

a. [ Gr. 'egke`falos + -oid. ] Resembling the material of the brain; cerebriform. [ 1913 Webster ]

Encephaloid cancer (Med.), a very malignant form of cancer of brainlike consistency. See under Cancer. [ 1913 Webster ]

n. An encephaloid cancer. [ 1913 Webster ]

n. [ Gr. 'egke`falos the brain + -logy. ] The science which treats of the brain, its structure and functions. [ 1913 Webster ]

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

n. [ Gr. 'egke`falos the brain + pa`schein, paqei^n, to suffer. ] (Med.) Any disease or symptoms of disease referable to disorders of the brain; as, lead encephalopathy, the cerebral symptoms attending chronic lead poisoning. [ 1913 Webster ]

n. [ NL., fr. Gr. 'egke`falos; 'en in + kefalh` head. ] (Anat.) The encephalon. [ 1913 Webster ]

In man the encephalos reaches its full size about seven years of age. Sir W. Hamilton. [ 1913 Webster ]

n. [ Gr. 'egke`falos the brain + &unr_; a cutting. ] (Surg.) The act or art of dissecting the brain. [ 1913 Webster ]

a. (Zoöl.) Having a head; -- said of most Mollusca; -- opposed to acephalous. [ 1913 Webster ]

a. (Anat.) (a) Pertaining to the epencephalon. (b) Situated on or over 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. pl. [ NL. fr. Gr. gyro`s round + 'egke`falos the brain. ] (Zool.) The higher orders of Mammalia, in which the cerebrum is convoluted. -- Gyr`en*ceph"a*lous a. [1913 Webster]

‖n. pl. [ NL., fr. Gr. lisso`s smooth + 'egke`falos the brain. ] (Zool.) A general name for all those placental mammals that have a brain with few or no cerebral convolutions, as Rodentia, Insectivora, etc. [ 1913 Webster ]

‖n. pl. [ NL., fr. Gr. &unr_; to loose + &unr_; the brain. ] (Zool.) A group of Mammalia, including the marsupials and monotremes; -- so called because the corpus callosum is rudimentary. [ 1913 Webster ]

a. (Zool.) Pertaining to, or characteristic of, the Lyencephala. [ 1913 Webster ]

{ } a. [ Macro + encephalic, encephalous. ] Of or pertaining to macrencephaly; having a large brain. [ 1913 Webster ]

n. The condition of having an abnormally large braincase. [ WordNet 1.5 ]

a. (Anat.) Of or pertaining to the mesencephalon or midbrain. [ 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 ]

[ Micr- + Gr. &unr_; brain. ] Having a small brain. [ 1913 Webster ]

‖n. pl. [ NL. See Myelencephalon. ] (Zool.) Same as Vertebrata. [ 1913 Webster ]

a. (Anat.) Of or pertaining to the myelencephalon; cerebro-spinal. [ 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 ]

a. (Zool.) Of or pertaining to the Myelencephala. [ 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 ]

a. (Anat.) Of or pertaining to the prosencephalon. [ 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 ]

a. (Anat.) Of or pertaining to the rhinencephalon. [ 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 ]