boldoPronunciation: /ˈbɒldəʊ/Definition of boldo noun (plural boldos) an evergreen Chilean tree from which are obtained an edible fruit, a dye, and a medicinal leaf infusion. Peumus boldus, family Monimiaceae [mass noun] a medicinal preparation of the leaves of the boldo tree, used as a tonic and digestive aid. Origin: early 18th century: via American Spanish from Araucanian voldo