Medical Definition of AAT

alpha-1-antitrypsin AAT is a highly effective inhibitor of neutrophil elastase; an imbalance between levels of AAT and this elastase increases the risk of emphysema.— Edwin K. Silverman and Robert A. Sandhaus, The New England Journal of Medicine, 25 June 2009

Learn More About AAT

Dictionary Entries Near AAT

AAMT

AAT

AAV

See More Nearby Entries 

Cite this Entry

“AAT.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/AAT. Accessed 20 Sep. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
 AlphaBear 2

Spell words. Make bears.

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!