axion

axion

[ak-see-on]
noun Physics.
a hypothetical particle having no charge, zero spin, and small mass: postulated in some forms of quantum chromodynamics.

Origin:
1978; perhaps axi(al current) + -on1

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World English Dictionary
axion (ˈæksɪˌon)
 
n
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 & Unabridged 10th Edition
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Word Origin & History

axion
1978, from axial + scientific suffix -on.
Online Etymology Dictionary, © 2010 Douglas Harper
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