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Definition of proton

proton

/ˈproʊ.tɑːn/
pro · ton
Plural:protons
•
Adjective:protonic
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proton Lexical Profile

proton Game Scores & Validity

• noun

1

A stable subatomic particle occurring in all atomic nuclei, carrying a positive electric charge equal in magnitude to that of an electron.

Example

"The atomic number of a chemical element is determined by the number of protons in its nucleus."

Antonyms
View all antonyms for proton

• Rhymes for proton

• Nearby Words

protestingly
proto
protocol
proton
prototype
prototypical
prototypically

Word Origin & Etymology

Coined in 1920 by physicist Ernest Rutherford from Ancient Greek 'prōton' (neuter of 'prōtos', meaning 'first'), combined with the subatomic particle suffix '-on' modeled after 'electron'.

Cite this Entry

Wordmom. (2026). Definition of Proton. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/proton
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