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Definition of: callus
(kal′əs) noun plural ·lus·es
1. A callosity or thickening.
2. Physiol. The new bony tissue between and around the fractured ends of a broken bone in the process of reuniting.
3. Bot. The parenchymatous tissue which forms over a cut on a stem and protects the exposed wood.
—v.i. To form a callosity or callus. ◆ Homophone: callous. [<L, hard skin]
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