Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

opsonin

play
noun op·so·nin \ˈäp-sə-nən\

Definition of opsonin

  1. :  any of various proteins (as antibodies or complement) that bind to foreign particles and cells (as bacteria) making them more susceptible to the action of phagocytes



Origin of opsonin

Latin opsonare to buy provisions, cater (from Greek opsōnein) + English 1-in — more at oligopsony


First Known Use: 1903


Medical Dictionary

opsonin

play
noun op·so·nin \ˈäp-sə-nən\

Medical Definition of opsonin

  1. :  any of various proteins (as complement or antibodies) that bind to foreign particles and microorganisms (as bacteria) making them more susceptible to the action of phagocytes




Learn More about opsonin


Seen and Heard

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

WORD OF THE DAY

a smart aleck

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image567572573

Which of these is a synonym of unctuous?

prompt oily angry maudlin
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ