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Webster's 1913 Dictionary

SPERMATOGENESIS

Sper `ma *to *gen "e *sis, n. Etym: [Spermato- + genesis. ] (Biol.)

Defn: The development of the spermatozoids.

New American Oxford Dictionary

spermatogenesis

sper mat o gen e sis |ˌspərmətəˈjenəsis, spərˌma -ˌspərmədəˈʤɛnəsəs | ▶noun Biology the production or development of mature spermatozoa.

Oxford Dictionary

spermatogenesis

spermatogenesis |ˌspəːmətə (ʊ )ˈdʒɛnɪsɪs, spəˌmatə (ʊ )-| ▶noun [ mass noun ] Biology the production or development of mature spermatozoa.