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Definition of moult : 1. See Molt.
2. The act or process of changing the feathers, hair, skin, etc.; molting.
3. To cast, as the hair, skin, feathers, or the like; to shed.
4. To shed or cast the hair, feathers, skin, horns, or the like, as an animal or a bird.

Synonyms:

shake off, disgorge, ecdysis, throw off, drop, cast off, molt, throw away, molting, moulting, shed, slough, pour forth, throw, spill, cast, exuviate

Usage examples:

• One summer at a certain fashionable resort, let us call it villeggiatura of the Lepidoptera, the amusement programme had reached the last act, and people yawned for something new, when 'sweet charity' came to the rescue, and proposed an entertainment to raise funds for enlarging an ecclesiastical 'Columbary' where aged, unsightly and repentant doves might moult, and renew their plumage. - "At the Mercy of Tiberius", August Evans Wilson.
• Of course, they grow and moult until they arrive at the adult form. - "The Insect Folk", Margaret Warner Morley.
• Besides, their wings would probably moult. - "The Port of Adventure", Charles Norris Williamson and Alice Muriel Williamson.