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delta ray

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noun Physics.
  1. a low-energy electron emitted by a substance after bombardment by higher-energy particles, as alpha particles.
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Origin of delta ray

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for delta ray

delta ray

noun
  1. a particle, esp an electron, ejected from matter by ionizing radiation
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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