eraser

[ih-rey-ser]
noun
1.
a device, as a piece of rubber or cloth, for erasing marks made with pen, pencil, chalk, etc.
2.
a person or thing that erases.

Origin:
1780–90; erase + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
eraser (ɪˈreɪzə)
 
n
an object, such as a piece of rubber or felt, used for erasing something written, typed, etc: a pencil eraser

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

eraser
"thing that erases writing," 1790, Amer.Eng., agent noun from erase. Originally a knife for scraping off the ink. As a rubber product for removing pencil marks, from 1858.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
ERASER
enhanced recognition and sensing radar
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

eraser

piece of rubber or other material used to rub out marks made by ink, pencil, or chalk. The modern eraser is usually a mixture of vegetable oil, fine pumice, and sulfur bonded with rubber. The mix is processed, extruded, and vulcanized in rubber-processing equipment. In 1752 the Proceedings of the French Academy reported a suggestion for using caoutchouc, a vegetable gum produced by certain South American trees, to erase black lead marks. Caoutchouc was named rubber in 1770 by the English chemist Joseph Priestley, because it was used to rub out marks. The first patent on an integral pencil and eraser was issued in the United States to Joseph Rechendorfer of New York City on March 30, 1858.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
At the end of the day, no matter how fancy, a pencil is only as good as its
  eraser.
Certainly it is easier to edit and rewrite papers electronically than with
  pencil and eraser.
The land looked as though a giant eraser had rubbed back and forth over it.
Over the next several weeks, it grew to the size of a pencil eraser tip.
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