molt

periodic shedding of the cuticle in arthropods or the outer skin in reptiles

The act or process of changing the feathers, hair, skin, etc.; molting.

cast off hair, skin, horn, or feathers

To shed or cast the hair, feathers, skin, horns, or the like, as an animal or a bird.

To cast, as the hair, skin, feathers, or the like; to shed.