proton

noun

pro·​ton ˈprō-ˌtän 

: 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

protonic

prō-ˈtä-nik 

adjective

Examples of proton in a Sentence

Recent Examples on the Web

That partnership will continue and expand with the proton therapy, Schultz said. —Jessica Van Egeren, Journal Sentinel, 10 Nov. 2024

The medications do this by blocking the proton pump channel—a type of protein—in certain cells of the stomach wall. —Ashley Wong, Health, 24 Sep. 2024

Think about a nuclear fusion reaction in the core of a star, where two hydrogen atoms, each with a single proton, combine to become a helium atom, with two. —Lane Sainty, The Arizona Republic, 3 Nov. 2024

PPIs work by blocking the proton pump enzyme in certain cells of the stomach, which decreases the production of stomach acid. —Ashley Wong, Health, 24 Sep. 2024

Word History

Etymology

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

First Known Use

1920, in the meaning defined above

Phrases Containing proton

• proton pump inhibitor
• proton synchrotron

Kids Definition

proton

noun

pro·​ton ˈprō-ˌtän 

: an atomic particle that occurs in the nucleus of every atom and carries a positive charge equal in size to the negative charge of an electron

protonic

prō-ˈtän-ik 

adjective

Medical Definition

proton

noun

pro·​ton ˈprō-ˌtän 

: 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

protonic

prō-ˈtän-ik 

adjective