bacteriochlorophyll

[bak-teer-ee-oh-klawr-uh-fil, -klohr-]

bac·te·ri·o·chlo·ro·phyll

[bak-teer-ee-oh-klawr-uh-fil, -klohr-]
noun Biochemistry.
a pale blue-gray form of chlorophyll that is unique to the photosynthetic but anaerobic purple bacteria.

Origin:
1935–40; bacterio- + chlorophyll
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Bacteriochlorophyll is always a great word to know.
So is helium. Does it mean:
Symbol: He; atomic weight: 4.0026; atomic number: 2
Symbol: F; atomic weight: 18.9984; atomic number: 9
WordNet
bacteriochlorophyll

noun
a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants 
WordNet® 3.0, © 2006 by Princeton University.
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