noun
the blood group whose red cells carry the B antigen
• Hypernyms: ↑blood group, ↑blood type
* * *
nounUsage: usually capitalized G&B, often attributive
: the Lancefield group of 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
affected with Group B strep
Useful english dictionary. 2012.