noun Physics.
an elementary particle having the same mass and spin as an electron but having a positive charge equal in magnitude to that of the electron's negative charge; the antiparticle of the electron.

1930–35; posi(tive) + (elec)tron

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World English Dictionary
positron (ˈpɒzɪˌtrɒn)
physics the antiparticle of the electron, having the same mass but an equal and opposite charge. It is produced in certain decay processes and in pair production, annihilation occurring when it collides with an electron
[C20: from posi(tive + elec)tron]

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Word Origin & History

1933, coined from posi(tive) (elec)tron.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

positron pos·i·tron (pŏz'ĭ-trŏn')
A positively charged particle of the same mass and magnititude of charge as an electron. Also called antielectron, positive electron.

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
positron   (pŏz'ĭ-trŏn')  Pronunciation Key 
The antiparticle that corresponds to an electron. Also called antielectron.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
positron [(poz-i-tron)]

The antiparticle for an electron; it has the same mass as an electron, but carries a positive charge.

Note: Positrons are found in collisions initiated by cosmic rays.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The electron's antimatter counterpart, known as a positron, carries a positive
Now take an electron and the positron, think of them as mirror image's of each
There is no further discussion of the detected positron source.
Smash a positron and an electron and you get two or more gamma rays.
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