cid
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cid
slang An informal shortening of "acid," a common slang term for the hallucinogenic drug LSD (lysergic acid diethylamide). Sometimes spelled with an apostrophe to highlight the abbreviation. There were a few people passing around tabs of cid at the concert. A: "What the heck is wrong with Tom?" B: "Oh, just tripping on 'cid. He'll be fine."