from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A crystalline compound, C20H25N3O, derived from lysergic acid and used as a powerful hallucinogenic drug. Also called acid.
  • abbr. least significant digit

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • Initialism of £sd. (pounds, shillings, pence)
  • Initialism of lysergic acid diethylamide.
  • Initialism of Lake Shore Drive. (It is a freeway in Chicago.)
  • Initialism of Long Slow Distance. (It is a training method of long-distance running.)
  • Initialism of Longshore Drift. ( It is the movement of sand down a beach in relation to wave direction.)
  • Initialism of Longshore drift. (This is a geological process by which sediments move along a beach shore.)

from the GNU version of the Collaborative International Dictionary of English

  • n. lysergic acid diethylamide, a powerful hallucinogenic drug.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a powerful hallucinogenic drug manufactured from lysergic acid


l(y)s(ergic acid) d(iethylamide).
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin libra solidus denarius. (Wiktionary)
Initialism from German Lysergsäurediethylamid. (Wiktionary)
Other initialisms. (Wiktionary)


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  • One wonders what the acid content of this strain of medicinal marijuana must be.

    January 15, 2010