| bacillus | (noun) aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil | Synonyms: B |
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| bacitracin | (noun) a polypeptide antibiotic of known chemical structure effective against several types of Gram-positive organisms; usually applied locally | - |
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| coccobacillus | (noun) a bacterial cell intermediate in morphology between a coccus and a bacillus; a very short bacillus | - |
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| lactobacillus | (noun) a Gram-positive rod-shaped bacterium that produces lactic acid (especially in milk) | - |
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| streptobacillus | (noun) any of various rod-shaped Gram-negative bacteria | - |
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| thiobacillus | (noun) small rod-shaped bacteria living in sewage or soil and oxidizing sulfur | - |
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