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[Old English brægen = Middle Low German bragen, bregen, Middle & modern Dutch brein from West Germanic.]
1 The mass of substance contained in the skull of humans and other vertebrates;
singular & (usually) plural cerebral substance.
Originally specifically the cerebrum, now the entire organ;
transferred an analogous organ of an invertebrate. OE
2(a) The organ as the seat of sensation, motion, or human speech, the organ of thought, memory or imagination;
singular & (frequently) in plural intellectual power, intellect;
thought, sense, imagination. ME
2(b) singular & (frequently) in plural. A clever person; the cleverest person in a group, etc., the mastermind. colloquial. M19
3 An electronic device comparable in function to a brain;
a computer. Usually more fully electronic brain. M20
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