spermatidPronunciation: /ˈspəːmətɪd/Definition of spermatid noun Biology an immature male sex cell formed from a spermatocyte, which may develop into a spermatozoon without further division. Derivatives spermatidalPronunciation: /ˌspəːməˈtʌɪd(ə)l/ adjective spermatid in other Oxford dictionaries Definition of spermatid in the US English dictionary