LSD

Short definition from Wiktionary

Noun

1. 1
   Initialism of £sd (pounds, shillings, pence).
2. 2
   Abbreviation of lysergic acid diethylamide.
3. 3
   Initialism of Lake Shore Drive (freeway in Chicago).
4. 4
   Initialism of long slow distance (training method of long-distance running).
5. 5
   Initialism of longshore drift (geological process by which sediments move along a beach shore).
6. 6
   Initialism of limited-slip differential.
7. 7
   Initialism of lumpy skin disease.