callus /kalˈəs/

1. An area of thickened or hardened skin
2. New material by which fractured bones are consolidated (pathology)
3. Soft tissue that forms over a cut surface (botany)

• jack rabbits
• jack-rafter
• jack-rafters
• Jack Robinson
• Jack Russell
• Jack Russells
• Jack Russell terrier
• Jack Russell terriers
• mattings
• mattins
• mattock
• mattocks
• mattoid
• mattoids
• mattress
• mattresses
• maturable
• maturate
• maturated
• maturates
• maturating
• maturation
• maturational
• maturations
• maturative