[1] : The Collaborative International Dictionary of English v.0.48

forbidden \forbid"den\, a.
   prohibited; interdicted.
   1913 webster

         i know no spells, use no forbidden arts. --milton.
   1913 webster

   forbidden fruit.
   a any coveted unlawful pleasure, -- so called with
       reference to the forbidden fruit of the garden of eden.
   b bot. a small variety of shaddock citrus decumana.
       the name is given in different places to several
       varieties of citrus fruits.
       1913 webster
see also:
forbidden fruit citrus decumana 

[2] : The Collaborative International Dictionary of English v.0.48

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.
   1913 webster
see also:
citrus decumana forbidden fruit pompelmous 

[3] : WordNet (r) 2.0

citrus decumana
     n : southeastern asian tree producing large fruits resembling
         grapefruits syn: pomelo, pomelo tree, pummelo, shaddock,
          citrus maxima, citrus grandis
see also:
pomelo pomelo tree pummelo shaddock citrus maxima citrus grandis 

Citrus >> C Words
Citrus, definition of term: Citrus
citrus_pag1.html

Citrus Fruit >> C Words
Citrus Fruit, definition of term: Citrus Fruit
citrus+fruit_pag1.html