Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “LSD”

LSD

noun [U] uk   /ˌel.esˈdiː/ (slang acid) us  
an illegal drug that causes people who use it to see the world differently from the way it really is or to see things that do not really existSpecific types of drugDrugs - general wordsSpecific medicines and drugs
(Definition of LSD from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of LSD?
Browse related topics

You are looking at an entry to do with Specific types of drug, but you might be interested in these topics from the Drugs topic area:

Add Cambridge dictionaries to your browser to your website

Word of the Day

nip

to press something quickly and quite hard between two objects, especially sharp objects such as teeth or nails

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More