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LSD

"lysergic acid diethylamide," 1950 (as LSD 25), from German LSD (1947), from letters in Lysergsäure-diäthylamid, the German form of the chemical name. For first element, see lysergic. German säure "acid" is cognate with English sour (adj.).

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Definitions of LSD from WordNet

lsd (n.)
a powerful hallucinogenic drug manufactured from lysergic acid;
Synonyms: lysergic acid diethylamide
From wordnet.princeton.edu