Etymology
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eubacteria (n.)

singular eubacterium, 1939, coined in German 1930; see eu-, here meaning "good," + bacteria. Classically, as an adverb, eu should form compounds only with verbs.

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Definitions of eubacteria

eubacteria (n.)
a large group of bacteria having rigid cell walls; motile types have flagella;
Synonyms: eubacterium / true bacteria
From wordnet.princeton.edu