Look up callus in Wiktionary, the free dictionary.

Callus means a hardening of a certain object or substance. It can refer to:

• Callus, an area of toughened skin
• Fibrocartilage callus, the temporary new bony tissue that forms at the ends of a fractured bone
• Callus (cell biology), a mass of cells that has yet to differentiate
• Callus (emulator), an emulator for Capcom arcade games made by Bloodlust Software
• A thickened layer of shell material over the umbilicus, in the genus Nautilus (with the exception of the Nautilus macromphalus)

[edit] See also

• Thick skin
• Callous, a trait where a person lacks empathy, or at least ignores it; hardhearted

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