nounπShareA hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use."After a summer of gardening, she had a thick callus on her palm from gripping the shovel. "bodymedicinephysiologyanatomyconditionChat with AIVocabulary GamePractice Reading
nounπShareThe material of repair in fractures of bone; a substance exuded at the site of fracture, which is at first soft or cartilaginous in consistency, but is ultimately converted into true bone and unites the fragments into a single piece."The doctor explained that the callus in Sarah's broken arm was healing well, and the fragments were slowly uniting. "medicinephysiologyanatomybodybiologysciencesubstanceChat with AIVocabulary GamePractice Reading
nounπShareThe new formation over the end of a cutting, before it puts out rootlets."The gardener carefully examined the cutting, noting the developing callus before planting it. "plantbiologyagricultureChat with AIVocabulary GamePractice Reading
nounπShareA shining area on the frons of many species of Tabanomorpha (horse flies and relatives)."The horse fly's callus shone brightly under the afternoon sun. "anatomyinsectbiologyanimalChat with AIVocabulary GamePractice Reading
verbπShareTo form such hardened tissue.""After gardening all summer, my hands started to callus." "bodyphysiologymedicineChat with AIVocabulary GamePractice Reading