Medical Definition of MDA
: a synthetic amphetamine derivative C10H13NO2 used illicitly for its mood-enhancing and hallucinogenic properties
— called also methylenedioxyamphetamine
Test Your Vocabulary
Who Knew?
-
- What is a ruelle?

Test your visual vocabulary with our 10-question challenge!
TAKE THE QUIZ
Anagram puzzles meet word search.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Share MDA