IPA: /ˌjuːnɪˈsɛkʃəl/
KK: /junɪˈsɛkʃuəl/
Relating to or having characteristics of only one sex, not both.
The plant species is unisexual, meaning it has either male or female reproductive organs, but not both.
Unisexual → It is formed from "uni-" (meaning one) and "sexual" (from Latin "sexus", meaning sex or gender). The word "unisexual" refers to having only one sex or gender.
Think of 'one' ('uni-') related to 'sex' ('sexual') — that's why unisexual means having only one sex.