Source : Webster's Revised Unabridged Dictionary (1913)

Hayfork \Hay"fork`\, n.
   A fork for pitching and tedding hay.

   {Horse hayfork}, a contrivance for unloading hay from the
      cart and depositing it in the loft, or on a mow, by horse
      power.

Source : WordNet®

hayfork
     n : a long-handled fork for turning or lifting hay