endosperm
noun
nutritive matter in seed-plant ovules, derived from the embryo sac.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Seeds in which endosperm or perisperm or both exist are commonly called albuminous or endospermic, those in which neither is found are termed exalbuminous or exendospermic.
From Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 by Various