1903 2 May 705/1 Two cases of diplococcal septicaemia.
1908 15 Feb. 484/1 A diplococcal infection of the throat.
1950 K. A. Bisset ix. 117 The two-celled structure [of Neisseria gonorrhœæ] is concealed by the gram-complex in the gram-positive species, and has been misinterpreted as ‘diplococcal’ in the gram-negative.