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bacillus (n.)

1877, medical Latin, from Late Latin bacillus "wand," literally "little staff," diminutive of baculum "a stick, staff, walking stick," from PIE *bak- "staff" (also source of Greek bakterion; see bacteria) + instrumentive suffix -culo. Introduced as a term in bacteriology 1853 by German botanist Ferdinand Cohn (1828-1898).

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Definitions of bacillus from WordNet

bacillus (n.)
aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil;
Synonyms: b
From wordnet.princeton.edu