pneumococcus Syllabification: (pneu·mo·coc·cus)Pronunciation: /ˌn(y)o͞omōˈkäkəs/Definition of pneumococcus noun (plural pneumococci /-ˈkäksī, -ˈkäksē/) a bacterium associated with pneumonia and some forms of meningitis. Streptococcus pneumoniae, a Gram-positive diplococcus Derivatives pneumococcal adjective pneumococcus in other Oxford dictionaries Definition of pneumococcus in the British & World English dictionary
