1. an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot)

2. bony tissue formed during the healing of a fractured bone

3. (botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid

1. cause a callus to form on;

   "The long march had callused his feet"
   

2. form a callus or calluses;

   "His foot callused"
   

1.胼胝;老茧;硬结
Acallus is an unwanted area of thick skin, usually on the palms of your hands or the soles of your feet, which has been caused by something rubbing against it.

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1. 骨痂：6)骨折的愈合:骨折愈合是一个连续的过程,其基本过程是先形成肉芽组织,再由成骨细胞在肉芽组织上产生新骨称为骨痂(callus)依靠骨痂使骨折断端连接并固定.

2. 胼胝：2.胼胝(callus)为蜡黄色,扁平或隆起的限局性角化增厚. 质坚硬,表面皮纹清晰可见,局部汗液分泌减少,感觉迟钟,可有轻度压痛. 好发于掌跖,与职业有关者也可见于其他受压部位.

3. 愈伤组织：愈伤组织及其形成 愈伤组织(callus)原指植物体的局部受到创伤刺激后,在伤口表面新生的组织. 它由活的薄壁细胞组成,可起源于植物体任何器官内各种组织的活细胞. 在植物体的创伤部分,愈伤组织可帮助伤口愈合;在嫁接中,

4. 愈合组织：我们利用现有的酸味种及甜味种各l0株,以环状剥皮的方法再以水苔包裹,外包塑料布,上下敷紧,进行试验,结果显示酸味种经压条处理后1个月即有80%生根率,而甜味种经3个月试验期则仅出现愈合组织(callus)并无根发生.