spermatozoidPronunciation: /ˌspəːmətə(ʊ)ˈzəʊɪd, spəˌmat-/Definition of spermatozoid noun Botany a motile male gamete produced by a lower plant or a gymnosperm. Also called antherozoid.spermatozoid in other Oxford dictionaries Definition of spermatozoid in the US English dictionary