loony bin

Noun

WordNet 3.0

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Webster's Dictionary (GCIDE)

loony bin \loony bin\ (l[=oo]n"[y^] b[i^]n) n. An institution for the confinement or treatment of insane persons, such as an insane asylum or the psychiatric ward of a hospital. [slang]

Syn: mental institution. [PJC]

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