Neis·se·ria | \ nī-ˈsir-ē-ə 
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\Medical Definition of Neisseria
: a genus (the type of the family Neisseriaceae) of parasitic bacteria that grow in pairs and occasionally tetrads, thrive best at 98.6°F (37°C) in the animal body or serum media, and include the gonococcus (N. gonorrhoeae) and meningococcus (N. meningitidis)
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