endosperm

n. nutritive tissue in a seed of a flowering plant that surrounds the embryo (Botany)

Endosperm is the albumen tissue produced in the seeds of most flowering plants around the time of fertilization. It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein. This makes endosperm an important source of nutrition in human diet as well. For example, wheat endosperm is ground into flour for bread, while barley endosperm is the main source for beer production. Other examples for edible endosperm are coconut "meat", popcorn and banana.
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Noun
1. nutritive tissue surrounding the embryo within seeds of flowering plants
(hypernym) reproductive structure
(part-holonym) seed

endosperm

(n.)
The albumen of a seed; -- limited by recent writers to that formed within the embryo sac.