noun, plural bacteroides.
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.

1919; < Neo-Latin; see bacter(i)-, -oid Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Medical Dictionary

Bacteroides Bac·te·roi·des (bāk'tə-roi'dēz)
A genus of gram-negative, anaerobic, rod-shaped, non-sporeforming bacteria that occur in the respiratory, intestinal, and urogenital tracts of warm-blooded animals and include some pathogenic species.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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