n 1  cap  :  the type genus of the family Mycoplasmataceae containing minute pleomorphic gram-negative chiefly nonmotile microorganisms without cell walls that are intermediate in some respects between viruses and bacteria and are mostly parasitic usu. in mammals - see PLEUROPNEUMONIA2    2  pl  -mas  or  -ma*ta   :  any microorganism of the genus Mycoplasma or of the family Mycoplasmataceae - called also pleuropneumonia-like organism , PPLO  my*co*plas*mal adj 
 
 
 
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