a scraped spot or area; the result of rubbing or abrading: abrasions on his leg caused by falling on the gravel.
the act or process of abrading.

1650–60; < Medieval Latin abrāsiōn- (stem of abrāsiō), equivalent to abrās(us) scraped off (past participle of abrādere; see abrade) + -iōn- -ion

1. sore, scrape, lesion. 2. rubbing, erosion.
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World English Dictionary
abrasion (əˈbreɪʒən)
1.  the process of scraping or wearing down by friction
2.  a scraped area or spot; graze
3.  geography attrition Compare corrasion the effect of mechanical erosion of rock, esp a river bed, by rock fragments scratching and scraping it; wearing down
[C17: from Medieval Latin abrāsiōn-, from the past participle of Latin abrādere to abrade]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1650s, from M.L. abrasionem "a scraping," noun of action from L. abrasus, pp. of abradere, from ab- "off" + radere "to scrape" (see raze).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

abrasion a·bra·sion (ə-brā'zhən)

  1. A scraping away of a portion of a surface.

  2. The wearing down or rubbing away or removal of the superficial layers of skin or mucous membrane in a limited area.

  3. The pathological wearing away of tooth substance by mechanical means; grinding.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
abrasion   (ə-brā'zhən)  Pronunciation Key 
  1. The process of wearing away a surface by friction. A rock undergoes abrasion when particles of sand or small pieces of rock are carried across its surface by a glacier, stream, or the wind.

  2. A scraped area on the skin or mucous membranes.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It may be worth noting that a bristle toothbrush can cause micro-abrasions even when brushing gums gently.
The gloves serve two purposes: buffering road shock while you ride and
  minimizing abrasions in case of a fall.
No mouth or foot abrasions were found, indicating the dog did not try to escape.
The white bumps on a right whale's head are skin abrasions called callosities.
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