unisexual Syllabification: (u·ni·sex·u·al)Pronunciation: /ˌyo͞onəˈsekSHo͞oəl/Definition of unisexual adjective (of an organism) either male or female; not hermaphrodite. Botany (of a flower) having either stamens or pistils but not both. Derivatives unisexualityPronunciation: /-ˌsekSHo͞oˈalitē/ noun unisexually adverb unisexual in other Oxford dictionaries Definition of unisexual in the British & World English dictionary