bacteroides

noun, plural bac·te·roi·des.

1. any of several rod-shaped, anaerobic bacteria of the genus Bacteroides, occurring in the alimentary and genitourinary tracts of humans and other mammals, certain species of which are pathogenic.

n.

1. A genus of gram-negative, anaerobic, rod-shaped, non-spore-forming bacteria that occur in the respiratory, intestinal, and urogenital tracts of warm-blooded animals and include some pathogenic species.