IgM

noun
\ ˌī-(ˌ)jē-ˈem How to pronounce IgM (audio) \

Definition of IgM

1 : a class of immunoglobulins of high molecular weight including the primary antibodies that are released into the blood early in the immune response to be replaced later by IgG and that are highly efficient in binding complement
2 : an antibody of the class IgM

First Known Use of IgM

1969, in the meaning defined at sense 1

Learn More About IgM

Dictionary Entries Near IgM

igloo

IgM

ign

See More Nearby Entries 

Statistics for IgM

Cite this Entry

“IgM.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/IgM. Accessed 30 Nov. 2021.

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

More Definitions for IgM

IgM

noun
\ ˌī-ˌjē-ˈem How to pronounce IgM (audio) \

Medical Definition of IgM

1 : a class of immunoglobulins of high molecular weight that include the primary antibodies released into the blood early in the immune response to be replaced later by IgGs of lower molecular weight and that are highly efficient in binding complement
2 : an immunoglobulin of the class IgM

WORD OF THE DAY

Test Your Vocabulary

Name that Thing: Flower Edition

Name That Thing

Test your visual vocabulary with our 10-question challenge!

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!