thor·ough·pin 
(thûrō-pĭn′, thûrə-, thŭr-)
(thûrō-pĭn′, thûrə-, thŭr-)n.
An abnormal swelling on either side of the hock joint of horses and related animals.
[From its resemblance to a pin passing through the hock.]
- beheld
- behemoth
- behest
- behind
- behind back
- behind bars
- behindhand
- behind (one's) back
- behind one's back
- behind the eight ball
- behind-the-scenes
- behind the scenes
- behind the times
- behind the wheel
- Behn
- be hoist with one's own petard
- behold
- beholden
- beholder
- save (one's) breath
- save one's breath
- saver
- savin
- savine
- saving