Source : Webster's Revised Unabridged Dictionary (1913)

Diet \Di"et\, n. [F. di[`e]te, L. diaeta, fr. Gr. ? manner of
   living.]
   1. Course of living or nourishment; what is eaten and drunk
      habitually; food; victuals; fare. ``No inconvenient
      diet.'' --Milton.

   2. A course of food selected with reference to a particular
      state of health; prescribed allowance of food; regimen
      prescribed.

            To fast like one that takes diet.     --Shak.

   {Diet kitchen}, a kitchen in which diet is prepared for
      invalids; a charitable establishment that provides proper
      food for the sick poor.