beta particle

An electron or positron, especially one emitted at high energy in the decay of certain radioactive nuclei.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

beta particle

(General Physics) a high-speed electron or positron emitted by a nucleus during radioactive decay or nuclear fission

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

be′ta par`ticle

an electron or positron emitted from an atomic nucleus in beta decay.

[1900–05]

beta particle

A high-speed electron emitted by an atomic nucleus undergoing radioactive decay. A beta particle is created when a neutron becomes a proton. Beta particles have greater speed and penetrating power than alpha particles. ♦ The process by which a neutron becomes a proton and emits an electron is called beta decay. Beta decay results in the atomic number of an element being increased by one and its mass number staying the same. See more at radiation, radioactive decay.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

beta particle

An electron emitted by an isotope undergoing radioactive decay.

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Noun

beta particle - a high-speed electron or positron emitted in the decay of a radioactive isotope

subatomic particle, particle - a body having finite mass and internal structure but negligible dimensions

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