proton

noun
pro·​ton | \ ˈprō-ˌtän How to pronounce proton (audio) \

Definition of proton

: an elementary particle that is identical with the nucleus of the hydrogen atom, that along with the neutron is a constituent of all other atomic nuclei, that carries a positive charge numerically equal to the charge of an electron, and that has a mass of 1.673 × 10−27 kilogram

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Other Words from proton

protonic \ prō-​ˈtä-​nik How to pronounce protonic (audio) \ adjective

Examples of proton in a Sentence

Recent Examples on the Web But for almost a decade now, uncertainty about deuterium’s likelihood of absorbing a proton and turning into helium-3 has fogged up the picture of the universe’s first minutes. Quanta Magazine, "Physicists Pin Down Nuclear Reaction From Moments After the Big Bang," 11 Nov. 2020 Hydrogen consists of just a single proton in the nucleus and one electron in the orbital shell. Rhett Allain, Wired, "Here's How You Can 'See' Molecules—on a Whole 'Nother Planet," 26 Sep. 2020 Instead of striking a single proton or neutron in an atom, a low-energy neutrino interacts with the entire nucleus. William Charles Louis, Scientific American, "Hidden Neutrino Particles May Be a Link to the Dark Sector," 1 July 2020 As new, more precise experiments ramp up data collection, researchers are reassessing theories about how dark matter particles lighter than a proton might appear in their detectors. Daniel Garisto, Scientific American, "Direct Proof of Dark Matter May Lurk at Low-Energy Frontiers," 9 June 2020 Normal matter, called baryonic matter in this study, is made of the protons and neutrons that comprise both humans and star stuff. Ashley Strickland, CNN, "Mysterious fast radio bursts helped detect missing matter in the universe, study says," 27 May 2020 Of the original population of protons and electrons in the universe, roughly only one particle in a billion survived the first few seconds of creation. Dennis Overbye, New York Times, "Why the Big Bang Produced Something Rather Than Nothing," 15 Apr. 2020 Instead, quarks and gluons mingled freely in a dense soup until things cooled down sufficiently for protons to condense out of the QGP. Jennifer Ouellette, Ars Technica, "Physicists identify unique signature to confirm quark-gluon plasma in Universe," 1 May 2020 At one electrode, the anode, water splits into oxygen, electrons, and hydrogen ions, or protons. Robert F. Service, Science | AAAS, "Making commodity chemicals requires fossil fuels. New devices could do it with renewables," 4 May 2020

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

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First Known Use of proton

1920, in the meaning defined above

History and Etymology for proton

Greek prōton, neuter of prōtos first — more at proto-

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Time Traveler for proton

Time Traveler

The first known use of proton was in 1920

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Statistics for proton

Last Updated

24 Nov 2020

Cite this Entry

“Proton.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/proton. Accessed 5 Dec. 2020.

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More Definitions for proton

proton

noun
How to pronounce proton (audio)

English Language Learners Definition of proton

physics : a very small particle of matter that is part of the nucleus of an atom and that has a positive electrical charge

proton

noun
pro·​ton | \ ˈprō-ˌtän How to pronounce proton (audio) \

Kids Definition of proton

: a very small particle that exists in the nucleus of every atom and has a positive charge of electricity

proton

noun
pro·​ton | \ ˈprō-ˌtän How to pronounce proton (audio) \

Medical Definition of proton

: an elementary particle that is identical with the nucleus of the hydrogen atom, that along with neutrons is a constituent of all other atomic nuclei, that carries a positive charge numerically equal to the charge of an electron, and that has a mass of 1.673×10−24 gram

Other Words from proton

protonic \ prō-​ˈtän-​ik How to pronounce protonic (audio) \ adjective

More from Merriam-Webster on proton

Nglish: Translation of proton for Spanish Speakers

Britannica.com: Encyclopedia article about proton

Comments on proton

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