spermatozoid Syllabification: (sper·ma·to·zo·id)Pronunciation: /ˌspərmətəˈzoid, spərˌma-/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 British & World English dictionary