Synonym: Einstein, brainiac, brainpower, encephalon, genius, head, learning ability, mastermind, mental capacity, mentality, mind, nous, psyche, wit. Similar words: drain, strain, trainer, raining, terrain, by train, grained, training. Meaning: [breɪn] 
n. 1. that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord 2. mental ability 3. that which is responsible for one's thoughts and feelings; the seat of the faculty of reason 4. someone who has exceptional intellectual ability and originality 5. the brain of certain animals used as meat. v. 1. hit on the head 2. kill by smashing someone's skull.
n. 1. that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord 2. mental ability 3. that which is responsible for one's thoughts and feelings; the seat of the faculty of reason 4. someone who has exceptional intellectual ability and originality 5. the brain of certain animals used as meat. v. 1. hit on the head 2. kill by smashing someone's skull. 
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181. Britain has suffered a huge brain drain in recent years.
182. The actual damage to the brain cells is secondary to the damage caused to the blood supply.
183. I'm so tired, my poor befuddled brain can't absorb any more.
184. The human brain was thought to be inaccessible to experimental investigation.
185. A lack of oxygen may inhibit brain development in the unborn child.