\Chlo"ro*phyll\, n. [Gr. ? light green + ? leaf: cf.
F. chlorophylle.] (Bot.)
Literally, leaf green; a green granular matter formed in the
cells of the leaves (and other parts exposed to light) of
plants, to which they owe their green color, and through
which all ordinary assimilation of plant food takes place.
Similar chlorophyll granules have been found in the tissues
of the lower animals. [Written also {chlorophyl}.]