positron

2 ENTRIES FOUND:

pos·i·tron

noun \ˈpä-zə-ˌträn\

physics : a very small particle of matter that has a positive charge of electricity and that travels around the nucleus of an atom

Full Definition of POSITRON

:  a positively charged particle having the same mass and magnitude of charge as the electron and constituting the antiparticle of the electron —called also antielectron

Origin of POSITRON

positive + -tron (as in electron)
First Known Use: 1933

Rhymes with POSITRON

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pos·i·tron

noun \ˈpäz-ə-ˌträn\   (Medical Dictionary)

Medical Definition of POSITRON

: a positively charged particle having the same mass and magnitude of charge as the electron and constituting the antiparticle of the electron—called also positive electron

positron

noun    (Concise Encyclopedia)

Subatomic particle having the same mass as an electron but with an electric charge of +1 (an electron has a charge of 1). It constitutes the antiparticle (see antimatter) of an electron. The existence of the positron was a consequence of the electron theory of P.A.M. Dirac (1928), and the particle was discovered in cosmic rays by Carl D. Anderson (1905–1991) in 1932. Though they are stable in a vacuum, positrons react quickly with the electrons of ordinary matter, producing gamma rays by the process of annihilation. They are emitted in positive beta decay of proton-rich radioactive nuclei and are formed in pair production.

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