Source : Webster's Revised Unabridged Dictionary (1913)

Fallow \Fal"low\, a. [AS. fealu, fealo, pale yellow or red; akin
   to D. vaal fallow, faded, OHG. falo, G. falb, fahl, Icel.
   f["o]lr, and prob. to Lith. palvas, OSlav. plav[u^] white, L.
   pallidus pale, pallere to be pale, Gr. polio`s gray, Skr.
   palita. Cf. {Pale}, {Favel}, a., {Favor}.]
   1. Pale red or pale yellow; as, a fallow deer or greyhound.
      --Shak.

   2. [Cf. {Fallow}, n.] Left untilled or unsowed after plowing;
      uncultivated; as, fallow ground.

   {Fallow chat}, {Fallow finch} (Zo["o]l.), a small European
      bird, the wheatear ({Saxicola [oe]nanthe}). See
      {Wheatear}.