er·y·thri·na \-ˈthrīnə -rēnə\noun Etymology: New Latin, from erythr- + -ina 1.capitalized: a genus of tropical shrubs or trees (family Leguminosae) often cultivated and having trifoliolate leaves and chiefly reddish flowers in terminal racemes — see coral tree, kaffir boom 2.-s: any plant of the genus Erythrina