molt

Short definition from Wiktionary

Verb

1. 1
   To shed or lose a covering of hair or fur, feathers, skin, horns, etc, and replace it with a fresh one.
2. 2
   To shed in such a manner.
3. 3
   simple past of melt

Noun

1. 1
   The process of shedding or losing a covering of fur, feathers or skin etc.
2. 2
   The skin or feathers cast off during the process of moulting.