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delta ray

noun

, Physics.
  1. a low-energy electron emitted by a substance after bombardment by higher-energy particles, as alpha particles.


delta ray

noun

  1. a particle, esp an electron, ejected from matter by ionizing radiation
“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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Word History and Origins

Origin of delta ray1

First recorded in 1905–10

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delta particledelta rhythm