Medical Definition of alpha-1-antitrypsin
: a trypsin-inhibiting serum protein which inhibits the digestive action of elastase on the tissues of the lungs and whose deficiency is associated with the development of emphysema
—abbreviation AAT
Test Your Vocabulary
More Confusing Words—Quiz
-
- The magician
______
moved the selected card to the top of the deck.

Test your vocabulary with our 10-question quiz!
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Share alpha-1-antitrypsin