Spermatogonium \Sper`ma*to*go"ni*um\, n. [NL., fr. Gr. ????,
???, sperm + ??? offspring.] (Physiol.)
A primitive seminal cell, occuring in masses in the seminal
tubules. It divides into a mass (spermosphere) of small cells
(spermoblast), which in turn give rise to spermatozoids.
[1913 Webster]