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callus

 - 5 dictionary results

cal⋅lus

[kal-uhs] noun, plural -lus⋅es, verb, -lused, -lus⋅ing.
–noun
1. Pathology, Physiology.
a. a hardened or thickened part of the skin; a callosity.
b. a new growth of osseous matter at the ends of a fractured bone, serving to unite them.
2. Also, callose. Botany.
a. the tissue that forms over the wounds of plants, protecting the inner tissues and causing healing.
b. a deposit on the perforated area of a sieve tube.
c. (in grasses) a tough swelling at the base of a lemma or palea.
–verb (used without object)
3. to form a callus.
–verb (used with object)
4. to produce a callus or calluses on: Heavy work callused his hands.

Origin:
1555–65; < L callus, masc. var. of callum; see callous
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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cal·lus   (kāl'əs)   
n.   pl. cal·lus·es
    1. A localized thickening and enlargement of the horny layer of the skin. Also called callosity.

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

    3. Undifferentiated tissue that develops on or around an injured or cut plant surface or in tissue culture.

    4. The hardened, sometimes sharp base of the floret of certain grasses.

  1. Botany

    1. Undifferentiated tissue that develops on or around an injured or cut plant surface or in tissue culture.

    2. The hardened, sometimes sharp base of the floret of certain grasses.

intr.v.   cal·lused, cal·lus·ing, cal·lus·es
To form or develop such hardened tissue. See Usage Note at callous.

[Latin, masculine of callum.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

callus  (n.)
1563, from L., var. of callum "hard skin," related to callere "be hard," and cognate with Skt. kalika "bud," O.Ir. calath "hard."
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: cal·lus
Pronunciation: 'kal-&s
Function: noun
1 : a thickening of or a hard thickened area on skin
2 : amass of exudate and connective tissue that forms around a break in a bone and is converted into bone in the healing of the break
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

callus cal·lus (kāl'əs)
n. pl. cal·lus·es

  1. See callosity.

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

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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