"hardened skin," 1560s, from Latin callus, variant of callum "hard skin," related to callere "be hard," from PIE root *kal- (3) "hard" (cognates: Sanskrit kalika "bud," Old Irish calath "hard," Old Church Slavonic kaliti "to cool, harden").
例文
1. I walked to him and took his outstretched hand which was rough with callus .
私は彼に向かって、彼の繭だらけの手を握った。
2.PP 333 promote callus induction of ttiree kinds of varieties except Dixie Green.