a group of Gram-negative pink to purplish-brown bacteria, comprising the purple sulfur bacteria and purple nonsulfur bacteria, that occur in anaerobic aquatic environments and carry out a unique form of photosynthesis without oxygen, using the pigment bacteriochlorophyll.
Origin of purple bacteria
First recorded in 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for purple bacteria
Historical Examples of purple bacteria
There are also other bacteria (sulphur-bacteria, purple-bacteria, etc.) that show various peculiarities of metabolism.The Wonders of Life