• synonyms


noun Physics.
  1. 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.
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Origin of positron

First recorded in 1930–35; posi(tive) + (elec)tron
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for positron

Contemporary Examples

Historical Examples

  • These units are the positron, the negatron, and the neutron.

    Cube Root of Conquest

    Roger Phillips Graham

  • The design of the electron brain had completely ignored the polarity of the positron.

    Joy Ride

    Mark Meadows

  • As I am the only scholar in my field—the polarity of the positron—I have never been asked for information.

    Joy Ride

    Mark Meadows

British Dictionary definitions for positron


  1. 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
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Word Origin

C20: from posi (tive + elec) tron
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for positron


1933, coined from posi(tive) (elec)tron.

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Online Etymology Dictionary, © 2010 Douglas Harper

positron in Medicine


  1. A positively charged particle of the same mass and magnitude of charge as an electron.antielectron positive electron
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

positron in Science


  1. The antiparticle that corresponds to an electron. Also called antielectron
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

positron in Culture



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

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Positrons are found in collisions initiated by cosmic rays.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.