any prokaryotic microorganism of the genus Mycoplasma, some species of which cause disease (mycoplasmosis) in animals and humans
mycoplasma in American English
(ˌmaɪkoʊˈplæzmə)
noun
any of a class (Mollicutes) of bacteria that lack cell walls and may cause disease, esp. of the joints and lungs, in humans and domestic animals, or may be pathogenic for plants