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delta ray

noun Physics.

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

Words nearby delta ray

delta granule, delta hepatitis, deltaic, delta iron, delta particle, delta ray, delta rhythm, Deltasone, delta stock, Delta team, delta wave
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for delta ray

delta ray

noun

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