roselle UK /ɹəʊˈzɛl/US /ɹoʊˈzɛl/ noun1 •Hibiscus sabdariffa, an edible flower in the hibiscus family used to make hibiscus tea.I planted some roselle in the garden so I can start making my own hibiscus tea instead of relying on processed agua de jaimaica powders. formsroselles