n 1  cap  :  a genus of gram-negative anaerobic bacteria that belong to the family Bacteroidaceae, that have rounded ends, produce no endospores and no pigment, and that occur usu. in the normal intestinal flora  2  pl  -roides  :  a bacterium of the genus Bacteroides or of a closely related genus .
 
 
 
Similar sounding terms:  Bac·te·roi·da·ce·ae 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.