ˌan-ˌtī- How to pronounce antiproton (audio)
: the antiparticle of the proton

Examples of antiproton in a Sentence

Recent Examples on the Web So an anti-electron would have a positive instead of a negative charge while an antiproton would have a negative instead of a positive charge. Jennifer Ouellette, Ars Technica, 27 Sep. 2023 Colliding protons and antiprotons, the Tevratron's DZero group found more matter than antimatter. Joseph Calamia, Discover Magazine, 19 Nov. 2019 The antiprotons used in the ALPHA experiment came from the CERN Proton Synchrotron, not the Large Hadron Collider. New York Times, 2 Oct. 2023 Likewise, while protons are positively charged, antiprotons are negatively charged. Reuters, NBC News, 28 Sep. 2023 Fermilab commissioned its antiproton source in 1985 and 1986, and began collisions, redubbing the machine the Tevatron, as the ultimate goal was to reach 1 TeV per beam of energy - a trillion volts! John Conway, Discover Magazine, 10 Jan. 2011 In this case, the antimatter was an antiproton. John Timmer, Ars Technica, 16 Mar. 2022 This separation—called the hyperfine split—is caused by interactions between the antiproton and the helium nucleus. John Timmer, Ars Technica, 16 Mar. 2022 At 2pm today, in a field not far from downtown Chicago, a final proton will smash into an antiproton. Daniel Holz, Discover Magazine, 30 Sep. 2011

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'antiproton.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1931, in the meaning defined above

Time Traveler
The first known use of antiproton was in 1931

Dictionary Entries Near antiproton

Cite this Entry

“Antiproton.” Dictionary, Merriam-Webster, Accessed 25 Jun. 2024.

Kids Definition


an·​ti·​pro·​ton ˌant-i-ˈprō-ˌtän How to pronounce antiproton (audio)
: the part of antimatter related to the proton

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