purple bacterium

noun

Medical Definition of purple bacterium

: any of various free-living bacteria that contain bacteriochlorophyll marked by purplish or sometimes reddish or brownish pigments

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“Purple bacterium.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/purple%20bacterium. Accessed 22 Sep. 2020.

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