sweetleaf noun5 •Any plant of the genus Stevia, from which stevia is extracted. •Sauropus androgynus, a plant of the family Phyllanthaceae whose leaves may be used as a potherb. •Symplocos tinctoria, an evergreen shrub or small tree in the southeastern United States. •Monarda fistulosa, wild bergamot, a medicinal and ornamental herb. •(slang) Cannabis. formssweetleafs