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Ovule
In seed plants, the ovule is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: the integument, forming its outer layer, the nucellus (or remnant of the megasporangium), and the female gametophyte (formed from a haploid megaspore) in its center. The female gametophyte — specifically termed a megagametophyte— is also called the embryo sac in angiosperms. The megagametophyte produces an egg cell for the purpose of fertilization.
Wikipedia
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Ovule (noun)
The structure in a plant that develops into a seed after fertilization; the megasporangium of a seed plant with its enclosing integuments.
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Ovule (noun)
An immature ovum in mammals.
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Ovum (noun)
The female gamete in animals; the egg cell.
Wiktionary
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