Source : Webster's Revised Unabridged Dictionary (1913)

Freestone \Free"stone`\, n.
   A stone composed of sand or grit; -- so called because it is
   easily cut or wrought.

Freestone \Free"stone`\, a.
   Having the flesh readily separating from the stone, as in
   certain kinds of peaches.

Source : WordNet®

freestone
     n : fruit (especially peach) whose flesh does not adhere to the
         pit