Source : Webster's Revised Unabridged Dictionary (1913)

Haycock \Hay"cock`\, n.
   A conical pile or hear of hay in the field.

         The tanned haycock in the mead.          --Milton.

Source : WordNet®

haycock
     n : a small cone-shaped pile of hay that has been left in the
         field until it is dry enough to carry to the hayrick