endosperm

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en·do·sperm

(en'dō-spĕrm),
A storage tissue found in many seeds that nourishes the embryo of a plant.

endosperm

a TRIPLOID (1) tissue found in many angiosperm seeds (e.g. those of the castor oil plant), that serves as a food source for the embryo which develops within it. Nonendospermic seeds (e.g. the runner bean) store their food substances within the cotyledons. See EMBRYO SAC for origin.