[spaw-ley-shuh n]

noun Physics.

a nuclear reaction in which several nucleons are released from the nucleus of an atom.

Nearby words

  1. spaldeen,
  2. spalding,
  3. spall,
  4. spallanzani,
  5. spallanzani, lazzaro,
  6. spallation product,
  7. spalpeen,
  8. spam,
  9. spambot,
  10. spammie

Origin of spallation

First recorded in 1945–50; spall + -ation Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for spallation

  • Two general types of reactions, known as spallation and fragmentation, are distinguished.

    LRL Accelerators|Lawrence Radiation Laboratory

British Dictionary definitions for spallation



physics a type of nuclear reaction in which a photon or particle hits a nucleus and causes it to emit many other particles or photons

Word Origin for spallation

C20: from spall + -ation

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

Medicine definitions for spallation




A nuclear reaction in which nuclei are bombarded by high-energy particles, causing the liberation of protons and alpha particles.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.