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Any of a group of pigments, especially one having the formula C55H74MgN4O6, that absorb light energy used in photosynthesis and that are found in photosynthetic bacteria that do not produce oxygen as a byproduct of photosynthesis.
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Noun1.bacteriochlorophyll - a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants
pigment - dry coloring material (especially a powder to be mixed with a liquid to produce paint, etc.)