WordNet (r) 3.0 (2006):

twinberry
    n 1: shrubby honeysuckle with purple flowers; western North
         America [syn: twinberry, Lonicera involucrata]
    2: creeping woody plant of eastern North America with shiny
       evergreen leaves and scarlet berries [syn: partridgeberry,
       boxberry, twinberry, Mitchella repens]