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.
proton
proton,
proton (prō´ton),
pro·ton (pr  t n )n. A stable, positively charged subatomic particle in the baryon family having a mass 1,836 times that of the electron. |
proton
[prō′ton]
Etymology: Gk, protos, first
a positively charged particle that is a fundamental component of the nucleus of all atoms. The number of protons in the nucleus of an atom equals the atomic number of the element. Compare electron, neutron. See also atomic mass.
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.
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.
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.
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.
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