Source : Webster's Revised Unabridged Dictionary (1913)

   {Barley bird} (Zo["o]l.), the siskin.

   {Barley sugar}, sugar boiled till it is brittle (formerly
      with a decoction of barley) and candied.

   {Barley water}, a decoction of barley, used in medicine, as a
      nutritive and demulcent.

Source : WordNet®

barley water
     n : used to feed infants