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A hypothetical boson having no charge or spin and small mass, proposed to explain the existence of certain symmetries of the strong nuclear force.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Atomic Physics) physics a hypothetical neutral elementary particle postulated to account for certain conservation laws in the strong interaction
[C20: from axi(om) + -on]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈæk siˌɒn)

an elementary particle having no charge, zero spin, and small mass, postulated to exist by some forms of quantum chromodynamics.
[1978; axi(al) + -on1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Lescheos says that Axion was the son of Priam and was slain by Eurypylus, the son of Euaemon.
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Canada's Western Financial Group Acquires Ontario Broker, Axion Insurance
In the low energy effective action, usually string theory based-models are comprised of two massless scalar fields, the dilaton, and the axion (see, e.g., [1]).
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