1. (noun)rose mallow, swamp mallow, common rose mallow, swamp rose mallow, Hibiscus moscheutos showy shrub of salt marshes of the eastern United States having large rose-colored flowers Synonyms: swamp mallow, common rose mallow, rose mallow, swamp rose mallow
2. (noun)rose mallow, Alcea rosea, Althea rosea plant with terminal racemes of showy white to pink or purple flowers; the English cottage garden hollyhock Synonyms: swamp mallow, common rose mallow, rose mallow, swamp rose mallow