Webster's English Dictionary

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callus

1. cal.lus \'kal-*s\ n [L] 1: a thickening of or a hard thickened area on 
   skin or bark  2: a substance exuded around the fragments of a broken bone 
   that is convert ed into bone and repairs the break 3: soft tissue that 
   forms over a wounded or cut plant surface 
2. callus vi : to form callus to cause callus to form on