Source : Webster's Revised Unabridged Dictionary (1913)

Zest \Zest\, v. t. [imp. & p. p. {Zested}; p. pr. & vb. n.
   {Zesting}.]
   1. To cut into thin slips, as the peel of an orange, lemon,
      etc.; to squeeze, as peel, over the surface of anything.

   2. To give a relish or flavor to; to heighten the taste or
      relish of; as, to zest wine. --Gibber.