Chlorophyll

[Sarah]

Literally, leaf green; a green granular matter formed in thecells of the leaves (and other parts exposed to light) of plants, towhich they owe their green color, and through which all ordinaryassimilation of plant food takes place. Similar chlorophyll granuleshave been found in the tissues of the lower animals. [Written alsochlorophyl.]

[Sarah]

Any of a group of green [pigments] that are found in the [chloroplasts] of plants and in other [photosynthetic organism]s such as [cyanobacteria], especially:
A waxy blue-black [microcrystalline] green-plant [pigment], C55H72MgN4O5, with a characteristic blue-green alcohol solution. Also called chlorophyll a.
A similar green-plant [pigment], C55H70MgN4O6, having a brilliant green alcohol [solution]. Also called chlorophyll b.

[Sarah]

a tetrapyrrole similar to heme but with a reduced ring and a long phytol chain esterified on to a carboxylic acid side chain. Falls into the class of organic chemicals called polyenes, which have alternating networks of single and double bonds.