plural noun, singular eu·bac·te·ri·um [yoo-bak-teer-ee-uh m] /ˌyu bækˈtɪər i əm/. Bacteriology.
  1. spherical or rod-shaped bacteria of the order Eubacteriales, characterized by simple, undifferentiated cells with rigid walls.

Origin of eubacteria

From New Latin, dating back to 1935–40; see origin at eu-, bacteria
Also called true bacteria. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for eubacterium


pl n singular -rium (-rɪəm)
  1. a large group of bacteria characterized by a rigid cell wall and, in motile types, flagella; the true bacteria

Word Origin for eubacteria

C20: via New Latin from Greek, from eu- (in the sense: true) + bacterium
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for eubacterium



coined in German 1930; see eu- + bacteria.

Online Etymology Dictionary, © 2010 Douglas Harper

eubacterium in Medicine


  1. A genus of anaerobic, nonsporeforming, nonmotile bacteria occurring in the intestinal tract; they attack carbohydrates and may be pathogenic.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.