OOSPHERE
oosphere
(noun) a gamete; used especially of lower plants
Source: WordNet® 3.1
Etymology
Noun
oosphere (plural oospheres)
(botany) A large nonmotile egg cell formed in an oogonium and ready for fertilization
Source: Wiktionary
O"ö*sphere, n. Etym: [Gr. sphere.]
1. (Bot.)
Definition: An unfertilized, rounded mass of protoplasm, produced in an
oögonium.
Note: After being fertilized by the access of antherozoids it becomes
covered with a cell wall and develops into an oöspore, which may grow
into a new plant like the parent.
2. (Bot.)
Definition: An analogous mass of protoplasm in the ovule of a flowering
plant; an embryonic vesicle. Goodale.
Source: Webster’s Unabridged Dictionary 1913 Edition