Bacterium Posted on November 8, 2022August 1, 2023 by Tex Norwood A single-celled, microscopic organism having a cell wall but no chlorophyllReproduces by cell division. Related Images:Related Articles: Glossary: ActinomyceteGlossary: Bacillus thuringiensisGlossary: Crown gallFungus Gnats – PestVisit our InfoTIP Glossary