| Noun | 1. | genus Mycoplasma - type and sole genus of the family Mycoplasmataceae bacteria genus - a genus of bacteria family Mycoplasmataceae, Mycoplasmataceae - pleomorphic Gram-negative nonmotile microorganism similar to both viruses and bacteria; parasitic in mammals mycoplasma - any of a group of small parasitic bacteria that lack cell walls and can survive without oxygen; can cause pneumonia and urinary tract infection |