an area of thick hard skin on a hand or foot, usually caused by rubbing 胼胝，老茧（手、足上的硬皮） The calluses on her palm showed how hard she had had to work. 她手掌上的老茧表明她不得不努力工作。
Word Originmid 16th cent.: from Latin callus (more commonly callum) ‘hardened skin’.