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A callus is a thick, hard patch of skin. Your body grows it to protect a place that keeps rubbing — a heel in new shoes, a palm from a or a shovel. It is not usually an open sore; it is extra skin, often yellowish and less sensitive than the skin beside it. The plural is calluses. Though actually, doctors also use callus for the new tissue that forms while a broken bone is healing, and use it for healing tissue on a cut plant. For most , the skin on hands and feet is the meaning you will meet. Do not mix it with callous, the word for an uncaring person.
繭；老繭
原始詞典資料7 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
callusnoun/ˈkæləs/
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A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use.
- Sylvanshine had once been on a first date with a Xerox rep who had complex and slightly repulsive patterns of callus on her fingers from playing the banjo semi-professionally
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The 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.
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biologybotanynatural-sciencesThe new formation over the end of a cutting, before it puts out rootlets.
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biologybotanynatural-sciencesIn orchids, a fleshy outgrowth from the labellum.
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biologybotanynatural-sciencesIn grasses, a hardened extension from the base of a floret, which may or may not elongate and is often covered in hairs or bristles.
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biologyentomologynatural-sciencesA shining area on the frons of many species of Tabanomorpha (horse flies and relatives).
callusverb/ˈkæləs/
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To form such hardened tissue.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。