pastern

noun3

1. •
   The part of a horse's leg between the fetlock joint and the hoof.

   • It was quite impossible to ride over the deeply-ploughed field; the earth bore only where there was still a little ice, in the thawed furrows the horse's legs sank in above its pasterns. — 1918
2. •
   (no longer used) A shackle for horses while pasturing.
3. •
   (no longer used) A patten.

   • Upright he walks, on pasterns firm and straight; His motions easy; prancing in his gait So straight she walk'd, and on her pasterns high. — 1697