The Collaborative International Dictionary
Spermosphere
Spermosphere \Sper"mo*sphere\, n. [Spermo- + sphere.] (Physiol.) A mass or ball of cells formed by the repeated division of a male germinal cell (spermospore), each constituent cell (spermoblast) of which is converted into a spermatozoid; a spermatogemma.
Wiktionary
spermosphere
n. (context physiology English) A mass or ball of cells formed by the repeated division of a spermospore, each spermoblast of which is converted into a spermatozoid.