streptococcus /ˌstrɛptəˈkɑːkəs/ noun plural streptococci /-ˈkɑːˌkaɪ/ /ˌstrɛptəˈkɑːˌkaɪ/ plural streptococci /-ˈkɑːˌkaɪ/ /ˌstrɛptəˈkɑːˌkaɪ/ Learner's definition of STREPTOCOCCUS
[count] medical
: a type of bacteria that causes diseases in people and animals链球菌