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Entry 2 senses Webster, 1913

Callus

/(kăl"lŭs)/ · Cal·lus · IPA /ˈkæləs/
01 n. Same as Callosity
  1. 1.
    Same as Callosity(Med.) See: Callosity
  2. 2.
    The new formation over the end of a cutting, before it puts out rootlets.(Hort.)