hibiscusPronunciation: /hɪˈbɪskəs/Definition of hibiscus noun a plant of the mallow family, grown in warm climates for its large brightly coloured flowers or for products such as fibre or timber. Genus Hibiscus, family Malvaceae: many species, including the rose mallow Origin:Latin, from Greek hibiskos, which Dioscorides identified with the marsh mallowhibiscus in other Oxford dictionaries Definition of hibiscus in the US English dictionary