brain
US /breɪn/
UK /breɪn/
1.
an organ of soft nervous tissue contained in the skull of vertebrates, functioning as the coordinating center of sensation and intellectual and nervous activity.
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The human brain is a complex organ.
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He suffered a severe brain injury.
2.
intellectual capacity; intelligence.
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She has a brilliant brain for mathematics.
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He's got the brains to solve this problem.