callus, callous

I see the phrase callus sometimes, I see callous formation. I know a callus is obviously a corn, but sometimes I see callous being used instead of callus. I would love some clarification on this from anyone in the know, thanks.  

• callus, callous - Stefanie
  • www.onelook.com is a great dictionary to use. nm - wandering
  • the -ous is an adjective form - sm - maybe this will help
  • Do you have a medical dictionary? - nm
    • or an English one for - that matter.

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