Source : Webster's Revised Unabridged Dictionary (1913)

Shaddock \Shad"dock\, n. [Said to be so called from a Captain
   Shaddock, who first brought this fruit from the East Indies.]
   (Bot.)
   A tree ({Citrus decumana}) and its fruit, which is a large
   species of orange; -- called also {forbidden fruit}, and
   {pompelmous}.

Source : WordNet®

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