A diplococcus (plural diplococci) is a round bacterium (a coccus) that typically occurs in the form of two joined cells. Examples of gram-negative diplococci are Neisseria spp., Moraxella catarrhalis, and Acinetobacter spp. Examples of gram-positive diplococci are Streptococcus pneumoniae and Enterococcus spp.
The word diplococcus is derived from "diplo", meaning double, and "coccus", meaning berry (referring to its spherical, ovoid, and generally round shape).
In former times, a bacterial genus Diplococcus was recognized, but it is not used anymore.
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