Mycoplasmataceae

noun plural

My·​co·​plas·​ma·​ta·​ce·​ae -ˌplaz-mə-ˈtā-sē-ˌē 

: a family (coextensive with the order Mycoplasmatales) of minute pleomorphic gram-negative nonmotile bacteria that have complex life cycles, are mostly parasitic usually in mammals, and are classified into the genera Mycoplasma and Ureaplasma