any of various spherical Gram-positive bacteria that occur in pairs, esp any of the genus Diplococcus, such as D. pneumoniae, which causes pneumonia: family Lactobacillaceae
Derived forms
diplococcal (ˌdiploˈcoccal) or diplococcic (ˌdɪpləʊˈkɒksɪk, -ˈkɒkɪk)