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.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/LSD. Accessed 27 January 2020.

Keep scrolling for more

More Definitions for LSD

LSD

noun
How to pronounce LSD (audio)

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

Keep scrolling for more

More from Merriam-Webster on LSD

Rhyming Dictionary: Words that rhyme with LSD

Spanish Central: Translation of 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

one that suddenly gains wealth or power

Get Word of the Day daily email!

Test Your Vocabulary

Intact Latin Quiz

  • roman tablet
  • What did focus mean in Latin?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

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!