Medical Definition of SpermatogenesisSpermatogenesis: The process of sperm formation. The term was created from the prefix "spermato-" (Greek sperma, the seed or germ) + "genesis" (the coming into being of something) = the coming into being of sperm. Spermatogenesis is in contrast to oogenesis, the process of egg (ovum) formation. Last Editorial Review: 5/13/2016
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