O"*sphere("*sfr), n. [Gr. w,'o`n an egg + E. sphere.]
(Bot.) An unfertilized, rounded mass of protoplasm, produced in an ogonium.
After being fertilized by the access of antherozoids it becomes covered with a cell wall and develops into an ospore, which may grow into a new plant like the parent.
(Bot.) An analogous mass of protoplasm in the ovule of a flowering plant; an embryonic vesicle.
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Fri 14th December 2018