antiproton

American  

[an-tee-proh-ton, an-tahy-] / ˈæn tiˌproʊ tɒn, ˈæn taɪ- /

noun

Physics.

1. an elementary particle having negative charge equal in magnitude to that of the electron and having the same mass and spin as a proton; the antiparticle of the proton.

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antiproton British  

/ ˈæntɪˌprəʊtɒn /

noun

1. the antiparticle of the proton; a particle having the same mass as the proton but an equal and opposite charge

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antiproton Scientific  

/ ăn′tē-prō′tŏn′,ăn′tī- /

1. The antiparticle that corresponds to the proton.

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Etymology

Origin of antiproton

First recorded in 1935–40; anti- + proton

Example Sentences

A giant machine that smashes atoms, it was used to find the antiproton, a discovery that led to a Nobel Prize.

From Seattle Times • Sep. 23, 2016

For example, antiprotons and antineutrons were first created in accelerator experiments in 1956 and the antiproton is negative.

From Textbooks • Aug. 12, 2015

Today CERN’s antiproton decelerator delivers low-energy antiprotons  for studies a range of experiments studying the properties of antimatter.

From Scientific American • Sep. 30, 2014

But an antiproton is rare, and it annihilates the moment it touches a proton.

From New York Times • Mar. 12, 2011

Thus it is impossible to test A proton and an antiproton collide at high energy, producing a couple of almost free quarks. grand unified theories directly in the laboratory.

From "A Brief History of Time: And Other Essays" by Stephen Hawking