In medicine, a common name of several cutaneous diseases, consisting of an eruption of vesicles or pustules, in distinct or confluent clusters, spreading over the body in various directions and hardening into scabs or crusts. It includes the shingles, ring- worm, milky scale (crusta lactea.) scald head.

In farriery, a cutaneous disease of animals, of the ring-worm kind, which spreads on the body in different directions, and occasions a troublesome itching.

To affect with the disease called tetters.