LSD

noun
\ ˌel-(ˌ)es-ˈdē How to pronounce LSD (audio) \

Definition of LSD

: a semisynthetic illicit organic compound C20H25N3O derived from ergot that induces extreme sensory distortions, altered perceptions of reality, and intense emotional states, that may also produce delusions or paranoia, and that may sometimes cause panic reactions in response to the effects experienced

called also lysergic acid diethylamide

First Known Use of LSD

1950, in the meaning defined above

History and Etymology for LSD

borrowed from German, from Lysergsäure-Diäthylamid "lysergic acid diethylamide"

Keep scrolling for more

Learn More about LSD

Statistics for LSD

Cite this Entry

“LSD.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/LSD. Accessed 8 Mar. 2021.

Style: MLA
MLA Chicago APA Merriam-Webster

Keep scrolling for more

More Definitions for LSD

LSD

noun

English Language Learners Definition of LSD

: an illegal drug that causes people to see and hear things that do not really exist

LSD

noun
\ ˌel-ˌes-ˈdē How to pronounce LSD (audio) \

Kids Definition of LSD

: a dangerous drug that causes hallucinations

LSD

noun
\ ˌel-ˌes-ˈdē How to pronounce LSD (audio) \

Medical Definition of LSD

: a semisynthetic illicit organic compound C20H25N3O derived from ergot that induces extreme sensory distortions, altered perceptions of reality, and intense emotional states, that may also produce delusions or paranoia, and that may sometimes cause panic reactions in response to the effects experienced

called also acid, lysergic acid diethylamide, lysergide

More from Merriam-Webster on LSD

Nglish: Translation of LSD for Spanish Speakers

Comments on LSD

What made you want to look up LSD? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Who Knew?

How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!