• synonyms


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.
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Origin of bacteroides

From New Latin, dating back to 1919; see origin at bacter(i)-, -oid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for bacteroides

Historical Examples of bacteroides

  • Cultivation and classification of "bacteroides," "symbionts," or "rickettsiae" of Blattella germanica.

    The Biotic Associations of Cockroaches

    Louis M. Roth

bacteroides in Medicine


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