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.]
- light-fingered
- light-fingeredness
- lightfoot
- light-footed
- light-footedly
- light-footedness
- light-handed
- light-handedly
- light-handedness
- lightheaded
- lightheadedly
- lightheadedness
- lighthearted
- lightheartedly
- lightheartedness
- light heavyweight
- "Light Horse Harry."
- lighthouse
- lighting
- light into
- lightly
- light meter
- light mill
- light-minded
- light-mindedly