Real Dictionary

wintergreen in American English
any of several gaultherias; esp., a creeping subshrub (Gaultheria procumbens) having small, rounded evergreen leaves, bell-shaped, white flowers, and red, edible berries
noun: a small, creeping, evergreen shrub, Gaultheria procumbens, of the heath family, common in eastern North America, having white, nodding, bell-shaped flowers, a bright-red, berrylike fruit, and aromatic leaves that yield a volatile oil

wintergreen in British English
noun: any of several evergreen ericaceous shrubs of the genus Gaultheria, esp G. procumbens, of E North America, which has white bell-shaped flowers and edible red berries