noun
1.
a. : a disease (as mal di gomma of citrus) that rots the stem or trunk of an affected plant near the ground
b. : a disease of cereals (as wheat) in which the culm blackens and decays resulting in lodging — compare take-all
2. : a progressive inflammation of the tissues in the region of the feet (as between the digits) of sheep or cattle ; specifically : a necrobacillosis marked by sloughing, ulceration, suppuration, and sometimes loss of the hoof — called also foul-foot