proton (redirected from Proton beam)

proton /pro·ton/ (pro´ton) an elementary particle that is the core or nucleus of an ordinary hydrogen atom of mass 1; the unit of positive electricity, being equivalent to the electron in charge and approximately to the hydrogen ion in mass. Symbol p.

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pro·ton (prtn)

n.

A stable, positively charged subatomic particle in the baryon family having a mass 1,836 times that of the electron.

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proton,

n positively charged subatomic particle that is located in the nucleus of an atom. Its mass is equivalent to that of a neutron. The number of protons is equivalent to the atomic number.

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proton (prō´ton),

n an elementary particle having a positive charge equivalent to the negative charge of the electron but possessing a mass approximately 1845 times as great; the proton is a nuclear particle, whereas the electron is extranuclear.

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proton

an elementary particle of mass number 1, with a positive charge equal to the negative charge of the electron; a constituent particle of every nucleus, the number of protons in the nucleus of each atom of a chemical element being indicated by its atomic number.

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proton pump

see sodium pump.

proton pump inhibitor

a class of therapeutic agents which are used to counteract the effects of proton pumps in tissues and organs, particularly used in counteracting gastric hypersecretion and acidity.