| birdbrain | | |
| n. (person) | 1. addle-head, addlehead, birdbrain, loon | a person with confused ideas; incapable of serious thought. |
| ~ misfit | someone unable to adapt to their circumstances. |
| brain | | |
| n. (body) | 1. brain, encephalon | that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord. |
| ~ circle of willis | a ring of arteries at the base of the brain. |
| ~ arteria communicans, communicating artery | any of three arteries in the brain that make up the circle of Willis. |
| ~ neural structure | a structure that is part of the nervous system. |
| ~ brain cell | a nerve cell in the brain. |
| ~ central nervous system, cns, systema nervosum centrale | the portion of the vertebrate nervous system consisting of the brain and spinal cord. |
| ~ neencephalon, neoencephalon | the part of the brain having the most recent phylogenetic origin; the cerebral cortex and related parts. |
| ~ forebrain, prosencephalon | the anterior portion of the brain; the part of the brain that develops from the anterior part of the neural tube. |
| ~ mesencephalon, midbrain | the middle portion of the brain. |
| ~ hindbrain, rhombencephalon | the posterior portion of the brain including cerebellum and brainstem. |
| ~ brain-stem, brain stem, brainstem | the part of the brain continuous with the spinal cord and comprising the medulla oblongata and pons and midbrain and parts of the hypothalamus. |
| ~ ventricle | one of four connected cavities in the brain; is continuous with the central canal of the spinal cord and contains cerebrospinal fluid. |
| ~ head, caput | the upper part of the human body or the front part of the body in animals; contains the face and brains.; "he stuck his head out the window" |
| n. (cognition) | 2. brain, brainpower, learning ability, mental capacity, mentality, wit | mental ability.; "he's got plenty of brains but no common sense" |
| ~ intelligence | the ability to comprehend; to understand and profit from experience. |
| n. (cognition) | 3. brain, head, mind, nous, psyche | that which is responsible for one's thoughts and feelings; the seat of the faculty of reason.; "his mind wandered"; "I couldn't get his words out of my head" |
| ~ cognition, knowledge, noesis | the psychological result of perception and learning and reasoning. |
| ~ noddle | an informal British expression for head or mind.; "use your noddle" |
| ~ tabula rasa | a young mind not yet affected by experience (according to John Locke). |
| ~ ego | (psychoanalysis) the conscious mind. |
| ~ unconscious, unconscious mind | that part of the mind wherein psychic activity takes place of which the person is unaware. |
| ~ subconscious, subconscious mind | psychic activity just below the level of awareness. |
| n. (person) | 4. brain, brainiac, einstein, genius, mastermind | someone who has exceptional intellectual ability and originality.; "Mozart was a child genius"; "he's smart but he's no Einstein" |
| ~ intellectual, intellect | a person who uses the mind creatively. |
| ~ prodigy | an unusually gifted or intelligent (young) person; someone whose talents excite wonder and admiration.; "she is a chess prodigy" |
| n. (food) | 5. brain | the brain of certain animals used as meat. |
| ~ organs, variety meat | edible viscera of a butchered animal. |
| ~ calf's brain | the brain of a calf eaten as meat. |
| v. (contact) | 6. brain | hit on the head. |
| ~ hit | deal a blow to, either with the hand or with an instrument.; "He hit her hard in the face" |
| v. (contact) | 7. brain | kill by smashing someone's skull. |
| ~ kill | cause to die; put to death, usually intentionally or knowingly.; "This man killed several people when he tried to rob a bank"; "The farmer killed a pig for the holidays" |
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