'Forbidden fruit' definitions:

Definition of 'forbidden fruit'

From: WordNet
noun
Originally an apple from the tree of knowledge of good and evil in the Garden of Eden; it is now used to refer to anything that is tempting but dangerous (as sexuality)

Definition of 'Forbidden fruit'

From: GCIDE
  • Forbidden \For*bid"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]

Definition of 'forbidden fruit'

From: GCIDE
  • 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]