Where does “LSD” come from?

LSD (Portuguese) comes from German LSD, from German Lysergsäure-diethylamid, from German Säure, from Middle High German siure.

LSD (Portuguese): LSD

Definitions

Step	Language	Word	Meaning
1	German	LSD	Initialism of Lysergsäure-diethylamid; LSD
2	German	Lysergsäure-diethylamid	The psychedelic drug LSD, acid
3	German	Säure	acid
4	Middle High German	siure	—

LSD — Etymology, Origin & Word History | Etymology Explorer