Oosphere
Oosphere (ō"o*sfēr) , noun
[Greek w,'o`n an egg + English sphere.]
1.
(Botany) An unfertilized, rounded mass of protoplasm, produced in an oogonium.
After being fertilized by the access of antherozoids it becomes covered with a cell wall and develops into an oospore, which may grow into a new plant like the parent.
2.
(Botany) An analogous mass of protoplasm in the ovule of a flowering plant; an embryonic vesicle. — Goodale