O antigen

noun

Medical Definition of O antigen

: an antigen that occurs in the body of a gram-negative bacterial cell

called also somatic antigen

— compare h antigen

Learn More About O antigen

Dictionary Entries Near O antigen

OA

O antigen

oat cell

See More Nearby Entries 

Cite this Entry

“O antigen.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/O%20antigen. Accessed 18 Oct. 2021.

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

WORD OF THE DAY

Test Your Vocabulary

Dog Words Quiz

  • shiba puppy more or less demanding cuddles
  • Which of the following animals has a dog in its etymology?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

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!