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[spaw-ley-shuh n] /spɔˈleɪ ʃən/
noun, Physics.
a nuclear reaction in which several nucleons are released from the nucleus of an atom.
Origin of spallation
1945-50; spall + -ation Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for spallation
  • The new mission calls for the development and use of spallation neutron sources for research and applications.
  • In this case the system is driven by a proton accelerator that provides the additional neutrons via the spallation process.
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
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
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spallation in Medicine

spallation spal·la·tion (spô-lā'shən)

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

  2. Fragmentation.

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