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Dictionary

pur'ple bacte'ria

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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

purple

purple finch

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