Main Entry:

¹cal·lus

Pronunciation:

\ˈka-ləs\

Function:

noun

Etymology:

Latin

Date:

1563

1 : a thickening of or a hard thickened area on skin or bark 2 : a mass of exudate and connective tissue that forms around a break in a bone and is converted into bone in healing 3 : soft tissue that forms over a wounded or cut plant surface