callus

American  

[kal-uhs] / ˈkæl əs /

noun

• calluses
  plural

1. Pathology, Physiology.

   1. a hardened or thickened part of the skin; a callosity.

   2. a new growth of osseous matter at the ends of a fractured bone, serving to unite them.

2. Botany. Also

   1. the tissue that forms over the wounds of plants, protecting the inner tissues and causing healing.

   2. a deposit on the perforated area of a sieve tube.

   3. (in grasses) a tough swelling at the base of a lemma or palea.

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verb (used without object)

callused, callusing

1. to form a callus.

verb (used with object)

callused, callusing

1. to produce a callus or calluses on.

   Heavy work callused his hands.

callus British  

/ ˈkæləs /

noun

1. Also called: callosity. an area of skin that is hard or thick, esp on the palm of the hand or sole of the foot, as from continual friction or pressure

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

3. botany

   1. a mass of hard protective tissue produced in woody plants at the site of an injury

   2. an accumulation of callose in the sieve tubes

4. biotechnology a mass of undifferentiated cells produced as the first stage in tissue culture

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verb

1. to produce or cause to produce a callus

callus Scientific  

/ kăl′əs /

1. An area of the skin that has become hardened and thick, usually because of prolonged pressure or rubbing.

2. The hard bony tissue that develops around the ends of a fractured bone during healing.

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Other Word Forms

Derived Forms

• uncallused
  adjective

Inflected Forms

Nouns

• calluses
  plural

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Etymology

Origin of callus

First recorded in 1555–65; from Latin callus, masculine variant of callum “tough skin, any hard substance”; see callous

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Explanation

A callus is a spot where your skin becomes rough and thick. After wearing flip flops every day, all summer long, you'll probably have a callus between your toes. If you get a blister from playing tennis or digging in the garden, it will eventually turn into a callus if you keep swinging your racquet or using your trowel. Any spot on your skin that's rubbed and irritated repeatedly becomes a callus, or a thickened patch of skin. In medicine, another kind of callus is the bony tissue that forms when a broken bone heals. Don't confuse callus with callous — which sounds the same but means "insensitive and cruel."

Example Sentences

See Examples For:

callus calluses callused callusing

A student of both men, Doyle would immortalize detection as a study in “little distinctions”—a callus, a stain, a footprint or the mark of a ligature could become hallmarks of a criminal investigation.

From The Wall Street Journal ● Oct. 23, 2026

“I want to build up a callus of hard work,” Fisch said.

From Seattle Times ● Apr. 3, 2024

And that callus blocks the need to find that time.

From Los Angeles Times ● Dec. 12, 2023

The cells formed a tumorlike tissue known as callus that could then be coaxed to grow into a seedling.

From Science Magazine ● May 17, 2023

This was not irrational worry, because dried blood was unusual, even for when the callus was cracked open.

From "Turtles All the Way Down" by John Green

Jobs that “put calluses on your hands—those are the only jobs I’ve ever had.”

From The Wall Street Journal ● Jun. 6, 2026

"Our final, clear polish could be put over any manicure or even bare nails, which could help people with calluses on their fingertips, too. So, it has both a cosmetic and lifestyle benefit," explains Desai.

From Science Daily ● Mar. 26, 2026

She was found with large calluses on her feet and ankles from constantly being on her hands and knees cleaning floors.

From BBC ● Mar. 12, 2026

“There’s a little bit of calluses built up where the rib was broken. But it’s mostly comfortable now, nothing too crazy.”

From Seattle Times ● Dec. 13, 2023

I have calluses on my hands from yard work.

From "Speak" by Laurie Halse Anderson

He could determine a man’s profession from the wear pattern on his trousers, from whether he was lightly or deeply tanned, or from which parts of his hands were callused.

From The Wall Street Journal ● Oct. 23, 2026

The miners dug hundreds of feet deep with shovels and their bare, callused hands.

From Seattle Times ● Aug. 8, 2022

“I’m afraid, everyone is afraid,” he said, clasping his hands, toughened and callused by years of fighting and manual labor.

From New York Times ● Mar. 11, 2022

At age 75, the tall, easy-mannered fisherman with a replaced knee and rough, callused hands is not as sure-footed as he once was.

From Los Angeles Times ● Oct. 15, 2021

He puts his big hands, warm and callused, over mine.

From "Merci Suárez Changes Gears" by Meg Medina

It is usually better, however, to place them for several weeks in a callusing bed before planting.

From Manual of American Grape-Growing by U. P. Hedrick

If left as long as this in the callusing bed most of the scion buds will have started and formed white shoots.

From Manual of American Grape-Growing by U. P. Hedrick

They are, therefore, stratified in a callusing bed where moisture and temperature can be controlled.

From Manual of American Grape-Growing by U. P. Hedrick

Bioletti, on callusing beds, 56. on grafting, 48, 52. on pruning in California, 151. on resistant stocks, 63. quoted, 18.

From Manual of American Grape-Growing by U. P. Hedrick

Conifer grafts are often placed in a grafting case for rapid callusing.

From Northern Nut Growers Association Report of the Proceedings at the Forty-Second Annual Meeting Urbana, Illinois, August 28, 29 and 30, 1951 by Northern Nut Growers Association

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