Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “proton”

proton

noun [C]     /ˈprəʊ.tɒn/ US  /ˈproʊ.t̬ɑːn/
a type of elementary particle (= very small piece of matter ) that has a positive electrical charge and is found in the nucleus of all atoms → Compare electron, neutronAtoms, molecules and sub-atomic particles
(Definition of proton noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of proton

Definitions of “proton” in other dictionaries

Word of the Day

friendship

a situation in which two people are friends

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More