n. a capsule of Quaalude, a tranquilizer. (Drugs.) : I don't know what he gave me. Mary said it was a “lude” or something.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Medical Dictionary
Main Entry: lude Pronunciation: 'lüd Function: noun : a pill of methaqualone —usually used in plural