Definitions for Protonˈproʊ tɒn

This page provides all possible meanings and translations of the word Proton

Princeton's WordNetRate this definition:(5.00 / 1 vote)

  1. proton(noun)

    a stable particle with positive charge equal to the negative charge of an electron

WiktionaryRate this definition:(0.00 / 0 votes)

  1. proton(Noun)

    A positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element; the nucleus of the most common isotope of hydrogen; composed of two up quarks and a down antiquark

  2. Origin: From πρῶτον, neuter of πρῶτος

FreebaseRate this definition:(0.00 / 0 votes)

  1. Proton

    The proton is a subatomic particle with the symbol p or p+ and a positive electric charge of 1 elementary charge. One or more protons are present in the nucleus of each atom. The number of protons in each atom is its atomic number. The name proton was given to the hydrogen nucleus by Ernest Rutherford in 1920, because in previous years he had discovered that the hydrogen nucleus could be extracted from the nuclei of nitrogen by collision, and was thus a candidate to be a fundamental particle and building block of nitrogen, and all other heavier atomic nuclei. In the modern Standard Model of particle physics, the proton is a hadron, composed of quarks. Prior to that model becoming a consensus in the physics community, the proton was considered a fundamental particle. In the modern view, a proton is composed of three valence quarks: two up quarks and one down quark. The rest masses of the quarks are thought to contribute only about 1% of the proton's mass. The remainder of the proton mass is due to the kinetic energy of the quarks and to the energy of the gluon fields that bind the quarks together. Because the proton is not a fundamental particle, it possesses a physical size—although this is not perfectly well-defined since the surface of a proton is somewhat fuzzy, due to being defined by the influence of forces that do not come to an abrupt end. The proton is about 1.6–1.7 fm in diameter.

Translations for Proton

From our Multilingual Translation Dictionary

Get even more translations for Proton »


Find a translation for the Proton definition in other languages:

Select another language:

Discuss these Proton definitions with the community:

Word of the Day

Would you like us to send you a FREE new word definition delivered to your inbox daily?

Please enter your email address:     


Use the citation below to add this definition to your bibliography:


"Proton." STANDS4 LLC, 2015. Web. 31 Mar. 2015. <>.

Are we missing a good definition for Proton? Don't keep it to yourself...

The Web's Largest Resource for

Definitions & Translations

A Member Of The STANDS4 Network

Nearby & related entries:

Alternative searches for Proton:

Thanks for your vote! We truly appreciate your support.