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alpha ray

noun, Physics.
1.
a stream of alpha particles.
Also called alpha radiation.
Origin
1900-1905
1900-05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for alpha-radiation

alpha ray

noun
1.
ionizing radiation consisting of a stream of alpha particles
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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alpha-radiation in Medicine

alpha ray n.
A stream of alpha particles or a single high-speed alpha particle.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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alpha-radiation in Science
alpha ray  
A stream of alpha particles.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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10
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