delta ray

noun Physics.

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

Origin of delta ray

First recorded in 1905–10

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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