WordNet (r) 3.0 (2006):

lungen
    n 1: tree of southeastern Asia to Australia grown primarily for
         its sweet edible fruit resembling litchi nuts; sometimes
         placed in genera Euphorbia or Nephelium [syn: longan,
         lungen, longanberry, Dimocarpus longan, Euphorbia
         litchi, Nephelium longana]