Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

MDA

noun
\ ˌem-(ˌ)dē-ˈā How to pronounce MDA (audio) \

Medical Definition of MDA

: a synthetic amphetamine derivative C10H13NO2 used illicitly for its mood-enhancing and hallucinogenic properties

— called also methylenedioxyamphetamine

Learn More about MDA

Dictionary Entries near MDA

MCV

Md

MD

MDA

MDI

MDMA

MDPV

Comments on MDA

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

Show Comments  Hide Comments 

WORD OF THE DAY

gritty

Listen to the pronounciation of gritty

showing courage and determination

Get Word of the Day daily email!

Test Your Vocabulary

Words for Summer: A Quiz

  • a closeup of a sunflower
  • Which of the following words means “of or relating to summer”?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Add Diction

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!

Words at Play
Ask the Editors
Word Games