What is the X in X-mas?
"lysergic acid diethylamide," 1950, from German "Lysergsäure-diäthylamid" (abbreviated LSD in a Swiss journal from 1947). See lysergic. L.s.d. as the abbreviation of "pounds, shillings, and pence" is recorded from 1853.
abbreviation of British currency units, from Latin librae, soldi, denarii, Roman equivalent of "pounds, shillings, pence."
Lysergic acid diethylamide; a crystalline compound derived from lysergic acid and used as a powerful hallucinogenic drug. Also called acid, lysergide.
Lysergic acid diethylamide, a hallucinogenic drug; acid: There is no rite of passage, such as smoking pot or tripping with LSD
[1960s+ Narcotics; found as a chemical abbreviation by 1947 in a Swiss journal]