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Definition of Chlorophyll b
1. Noun. A dark-green plant pigment having a brilliant green alcohol solution; generally characteristic of higher plants.
Medical Definition of Chlorophyll b
1. (CH3 at 7 replaced by CHO in the chlorophyll structure), magnesium(II) pheophytinate b [(pheophytinato b) magnesium(II)]; the chlorophyll generally characteristic of higher plants (including the Chlorophyta, Euglenaphyta, and green algae). Absent in other types of algae. (05 Mar 2000)