positron

noun
pos·​i·​tron | \ ˈpä-zə-ˌträn How to pronounce positron (audio) \

Definition of positron

: a positively charged particle having the same mass and magnitude of charge as the electron and constituting the antiparticle of the electron

called also antielectron

Examples of positron in a Sentence

Recent Examples on the Web The antiparticle version of an electron, for instance, is a positron. Caroline Delbert, Popular Mechanics, 21 Sep. 2021 The dance between positron and antiproton in antihydrogen should exactly follow that of the electron and proton in hydrogen. Sophia Chen, Wired, 19 Feb. 2020 In contrast, the higher energies used in the ALPHA experiment slow antiprotons and positrons down enough for the particles to form atoms of antihydrogen for more in-depth study. Jonathan O'callaghan, Scientific American, 19 Feb. 2020 Sometimes, the photon immediately decays into an electron and a positron, which are propelled forward by the photon’s momentum and strike the detector near one another. Quanta Magazine, 7 June 2016 Richard Feynman, a young professor at Cornell, had invented a novel method to describe the behavior of electrons and photons (and their antimatter equivalent, positrons). George Johnson, SFChronicle.com, 29 Feb. 2020 The electron, quark, and muon, for example, are paired with the positron, antiquark, and antimuon, respectively. Sophia Chen, Wired, 19 Feb. 2020 Bananas, which contain trace amounts of radioactive potassium, emit a positron every 75 minutes. Sophia Chen, Wired, 19 Feb. 2020 By contrast, the researchers observed that some electrons and positrons seem to be correlated in their emission direction. Chris Lee, Ars Technica, 20 Dec. 2019 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'positron.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of positron

1933, in the meaning defined above

History and Etymology for positron

positive + -tron (as in electron)

Learn More About positron

Time Traveler for positron

Time Traveler

The first known use of positron was in 1933

See more words from the same year

Dictionary Entries Near positron

positrino

positron

positron-emission tomography

See More Nearby Entries 

Statistics for positron

Cite this Entry

“Positron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/positron. Accessed 7 Aug. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for positron

positron

noun
pos·​i·​tron | \ ˈpäz-ə-ˌträn How to pronounce positron (audio) \

Medical Definition of positron

: a positively charged particle having the same mass and magnitude of charge as the electron and constituting the antiparticle of the electron

called also positive electron

More from Merriam-Webster on positron

Britannica.com: Encyclopedia article about positron

WORD OF THE DAY

Test Your Vocabulary

Odd Habits and Quirks

  • image1926873504
  • Which of the following best describes an easily irritated person?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!