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axion

[ak-see-on] /ˈæk siˌɒn/
noun, Physics.
1.
a hypothetical particle having no charge, zero spin, and small mass: postulated in some forms of quantum chromodynamics.
Origin
1978
1978; perhaps axi(al current) + -on1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for axion

axion

/ˈæksɪˌon/
noun
1.
(physics) a hypothetical neutral elementary particle postulated to account for certain conservation laws in the strong interaction
Word Origin
C20: from axi(om) + -on
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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Word Origin and History for axion
n.

1978, from axial + scientific suffix -on.

Online Etymology Dictionary, © 2010 Douglas Harper
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