noun Date: 1945 any of various strains of a streptococcus ( Streptococcus pyogenes ) that include the causative agents of pharyngitis, scarlet fever, septicemia, some skin infections, rheumatic fever, and glomerulonephritis
GROUP A
Meaning of GROUP A in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012