bacteriochlorophyll

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bac·te·ri·o·chlo·ro·phyll

(bak-tēr'ē-ō-klōr'ō-fil),
Any form of chlorophyll in photosynthetic bacteria: 1) bacteriochlorophyll a, -CH=CH2 replaced by -CO-CH3 in the chlorophyll α structure, two hydrogens also being added; the photosynthetic pigments of purple bacteria; 2) bacteriochlorophyll b, -CH=CH2 replaced by -CO-CH3 and -CH2-CH3 replaced by -CΞCH in the chlorophyll β structure, two hydrogens also being added.
Farlex Partner Medical Dictionary © Farlex 2012

bacteriochlorophyll

(băk-tîr′ē-ō-klôr′ə-fĭl)
n.
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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

bacteriochlorophyll

a form of CHLOROPHYLL possessed by photosynthetic bacteria (green and purple types). In addition to small amounts of bacteriochlorophyll, green bacteria mostly possess another type of chlorophyll called bacterioviridin.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005