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Definition of Chlorophyll a
1. Noun. A blue-black plant pigment having a blue-green alcohol solution; found in all higher plants.
Medical Definition of Chlorophyll a
1. Magnesium(II) pheophytinate a [(pheophytina to a)magnesium(II)];the major pigment found in all oxygen-evolving photosynthetic organisms (higher plants, and red and green algae). (05 Mar 2000)