Wiktionary
spermiogenesis
n. (context biology English) The final stage of spermatogenesis. It involves the maturation of the spermatids into spermatozoa.
Wikipedia
Spermiogenesis
Spermiogenesis is the final stage of spermatogenesis, which sees the maturation of spermatids into mature, motile spermatozoa. The spermatid is a more or less circular cell containing a nucleus, Golgi apparatus, centriole and mitochondria. All these components take part in forming the spermatozoon.