hard/tough skin/hide, callus; callousness, lack of feeling
Latin word, found 12 times in the texts on Socratos.
Cicero, Tusculanae Disputationes 2.36: … ercitationibus et dolor intercurrit non numquam, inpelluntur feriuntur abiciuntur cadunt, et ipse labor quasi callum quoddam obducit dolori.
Ovid, Metamorphoses 12.488: fractaque dissiluit percusso lammina callo.
All forms of callum