pomelo

from WordNet (r) 3.0 (2006)

pomelo
    n 1: southeastern Asian tree producing large fruits resembling
         grapefruits [syn: {pomelo}, {pomelo tree}, {pummelo},
         {shaddock}, {Citrus maxima}, {Citrus grandis}, {Citrus
         decumana}]
    2: large pear-shaped fruit similar to grapefruit but with coarse
       dry pulp [syn: {pomelo}, {shaddock}]

from The Collaborative International Dictionary of English v.0.48

Pomelo \Pom"e*lo\, n. [Cf. {Pompelmous}.]
   A variety of shaddock, called also {grape fruit}.
   [1913 Webster]