beta particle

noun Physics.
an electron or positron emitted from an atomic nucleus in a certain type of radioactive decay.

Origin:
1900–05

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Collins
World English Dictionary
beta particle
 
n
a high-speed electron or positron emitted by a nucleus during radioactive decay or nuclear fission

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

beta particle n.
A high-speed electron or positron, especially one emitted from the nucleus of an atom in radioactive decay.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
beta particle  
A high-speed electron or positron, usually emitted by an atomic nucleus undergoing radioactive decay. Beta particles are given off naturally by decaying neutrons in radioactive atoms and can be created in particle accelerators. Beta particles have greater speed and penetrating power than alpha particles but can be stopped by a sheet of aluminum that is 2 to 3 mm thick. See more at radioactive decay.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

beta particle

electron (unit negative charge) or positron (unit positive charge) spontaneously emitted by certain unstable atomic nuclei in the radioactive disintegration process of beta decay (q.v.).

Learn more about beta particle with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
When a radioactive nuclei emits a beta particle, a neutron transforms into a
  proton.
When a neutron transforms to a proton and a beta particle.
The beta particle can cause harm by ionizing atoms in its path, until it
  eventually stops and becomes a harmless electron.
As the beta particle approaches an atom it can interact with the nucleus by
  attraction.
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