rooibosPronunciation: /ˈrɔɪbɒs/Definition of rooibos noun South African an evergreen South African shrub of the pea family. Genus Aspalathus, family Leguminosae (also rooibos tea) [mass noun] an infusion of the leaves of the rooibos plant drunk as tea. Origin: early 20th century: from Afrikaans, literally 'red bush'rooibos in other Oxford dictionaries Definition of rooibos in the US English dictionary