anaphylatoxin

noun
an·​a·​phyl·​a·​tox·​in | \ ˌan-ə-ˌfil-ə-ˈtäk-sən How to pronounce anaphylatoxin (audio) \

Medical Definition of anaphylatoxin

: any of several peptides that promote acute inflammation and mediation of the immune response following activation of complement In the second type of [anaphylactic] reaction, immune complexes or other agents activate the complement cascade, resulting in the formation of anaphylatoxins (e.g., the complement protein fragment C3a and C5a), which can trigger the release of mediators from mast cells and basophils directly.— Bruce S. Bochner, The New England Journal of Medicine, 20 June 1991

Comments on anaphylatoxin

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

WORD OF THE DAY

to mark by some ceremony or observation

Get Word of the Day daily email!

Test Your Vocabulary

Challenging Vocabulary Quiz Returns!

  • stylized drawing of woman pole vaulting across gap to get trophy
  • Which is a synonym of fuliginous?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Syn City

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!