chlorophyll

n. green pigment found in plants (used in the production of plant food by photosynthesis)

Chlorophyll is a green  pigment found in most plants, algae, and cyanobacteria. Its name is derived from ancient Greek: chloros = green and phyllon = leaf. Chlorophyll absorbs light most strongly in the blue and red but poorly in the green portions of the electromagnetic spectrum, hence the green color of chlorophyll-containing tissues like plant leaves.
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Chlorophyll /chlo·ro·phyll/ any of a group of green magnesium-containing porphyrin derivatives occurring in all photosynthetic organisms; they [more]Chlorophyll - Community and Resources

Noun
1. any of a group of green pigments found in photosynthetic organisms
(synonym) chlorophyl
(hypernym) pigment
(hyponym) chlorophyll a

n. chlorophyll, green pigment found in plants