WordReference Random House Unabridged Dictionary of American English © 2025
del′ta ray′, [Physics.]
  1. Physicsa low-energy electron emitted by a substance after bombardment by higher-energy particles, as alpha particles.
  • 1905–10

Collins Concise English Dictionary © HarperCollins Publishers::
delta ray
  1. a particle, esp an electron, ejected from matter by ionizing radiation

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