a climbing vine (Parthenocissus tricuspidata) of the grape family, native to Japan and China, having shield-shaped leaves and purple berries: often grown to cover walls
See Boston ivy in American Heritage Dictionary 4
A high-climbing woody vine (Parthenocissus tricuspidata) native to eastern Asia and having three-lobed deciduous leaves. It frequently covers the outer walls of buildings and has attractive fall coloration. Also called Japanese ivy.