What does "mange" mean?

Mange: The scab or itch in cattle, dogs, and other beasts. Mange insect (Zoöl.), any one of several species of small parasitic mites, which burrow in the skin of cattle. horses, dogs, and other animals, causing the mange. The mange insect of the horse (Psoroptes, or Dermatodectes, equi), and that of cattle (Symbiotes, or Dermatophagys, bovis) are the most important species. See Acarina.