Definition of foot rot:
(n) :
A common infection of the hoof of animals such as cattle, sheep and goat caused by two species of anaerobic bacteria, Fusobacterium necrophorum and Bacteroides melaninogenicus; infectious pododermatitis.
(n) :
(slang) Athlete's foot.
(n) :
A disease of citrus plants, caused by a fungus of species Gibberella baccata.