noun
: any of various free-living bacteria that contain bacteriochlorophyll marked by purplish or sometimes reddish or brownish pigments — compare purple sulfur bacterium
noun
: any of various free-living bacteria that contain bacteriochlorophyll marked by purplish or sometimes reddish or brownish pigments — compare purple sulfur bacterium
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012