WordReference Random House Unabridged Dictionary of American English © 2020
bac•te•roi•des  (bak′tə roidēz),USA pronunciation n., pl.  -des. 
  1. Microbiologyany 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.
  • Neo-Latin; see bacter-, -oid
  • 1919

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