What is "mort stone"

Mort \Mort\, n. [F., death, fr. L. mors, mortis.]

1. Death; esp., the death of game in the chase.

2. A note or series of notes sounded on a horn at the death of game.

   The sportsman then sounded a treble mort.
   --Sir W. Scott.

3. The skin of a sheep or lamb that has died of disease.

   Mort cloth, the pall spread over a coffin; black cloth indicative or mourning; funeral hangings.
   --Carlyle.

   Mort stone, a large stone by the wayside on which the bearers rest a coffin. [Eng.]
   --H. Taylor.

n. (context UK obsolete English) A large stone by the wayside on which the bearers rest a coffin.