Group B

noun

Definition of Group B

: any of various strains of a streptococcus (Streptococcus agalactiae) that include the causative agents of certain infections (such as pneumonia and meningitis) especially of newborn infants usually used attributivelyGroup B streptococcal infections

First Known Use of Group B

1965, in the meaning defined above

Keep scrolling for more

Learn More about Group B

Time Traveler for Group B

Time Traveler

The first known use of Group B was in 1965

See more words from the same year

Statistics for Group B

Cite this Entry

“Group B.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Group%20B. Accessed 1 Dec. 2020.

Keep scrolling for more

More Definitions for Group B

Group B

noun
\ -ˈbē How to pronounce Group B (audio) \

Medical Definition of Group B

: the Lancefield group of usually beta-hemolytic streptococci that comprises all strains of a species of the genus Streptococcus (S. agalactiae) and that includes the causative agents of certain infections (as septicemia, pneumonia, and meningitis) especially of newborn infants usually used attributivelyaffected with Group B strep — compare group a

Comments on Group B

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

WORD OF THE DAY

Test Your Vocabulary

Musical Words Quiz

  • gramophone
  • Which word describes a musical performance marked by the absence of instrumental accompaniment?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

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!