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

Other Words from proton

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

Examples of proton in a Sentence

Recent Examples on the Web Instead, Helion’s approach is to make their own 3He by creating deuterium-deuterium fusion that creates 3He + a neutron and 3H + a proton. James Conca, Forbes, 9 Nov. 2021 Pressure is also generated when hydrogen nuclei, which each have one proton, fuse with other hydrogen nuclei to form helium, which has two protons. Priyamvada Natarajan, The New York Review of Books, 15 June 2021 For the nuclear processes involved in both creating and burning deuterium, that’s where deuterium fuses with a proton to form helium-3, an uncommon, light, but stable isotope of the element helium. Ethan Siegel, Forbes, 6 Apr. 2021 Inside an atom’s core, those forces — between protons and neutrons and even inside a proton itself — are all vectors. Ethan Siegel, Forbes, 19 Mar. 2021 In spite of the detectors’ sizes, a gravitational wave changes the relative lengths of their arms by less than the width of a proton. Adrian Cho, Science | AAAS, 10 Mar. 2021 According to a news release, Enviro-Master uses a non-toxic, non-corrosive and food-safe germicide that's dispensed from an electrostatic sprayer, basically the equivalent of a proton pack for germs. Slone Terranella, Detroit Free Press, 3 Dec. 2020 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, 11 Nov. 2020 Hydrogen consists of just a single proton in the nucleus and one electron in the orbital shell. Rhett Allain, Wired, 26 Sep. 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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Dictionary Entries Near proton

Protomycetales

proton

protonate

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Statistics for proton

Last Updated

7 Dec 2021

Cite this Entry

“Proton.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/proton. Accessed 18 Jan. 2022.

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More Definitions for proton

proton

noun

English Language Learners Definition of proton

: 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 proton (audio) \ adjective

More from Merriam-Webster on proton

Nglish: Translation of proton for Spanish Speakers

Britannica.com: Encyclopedia article about proton

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