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nutter (n.)

late 15c., "one who gathers nuts," from nut + -er (1). Meaning "crazy person" is British slang, by 1958, from nut + -er (3). Nuttery "mental hospital" is attested in slang from 1931; earlier it meant "place for storing nuts" (1881).

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Definitions of nutter from WordNet

nutter (n.)
a person who is regarded as eccentric or mad;
Synonyms: wacko / whacko
From wordnet.princeton.edu