ergot

noun3

1. •
   Any fungus in the genus Claviceps which are parasitic on grasses.
2. •
   The sclerotium (wintering stage) of certain fungi in the genus Claviceps, appearing as a deformed grain in certain cereals and grasses infected by the fungi.
3. •
   The wart-like growth of skin that covers the metacarpal pad on a horse or similar animal.

   • It is crossed medially and laterally by the ligament of the ergot (not shown), that, subcutaneously, connects the ergot with the hoof cartilage. — 2003