WordReference Random House Unabridged Dictionary of American English © 2025
ax•i•on
(ak′sē on′),USA pronunciation n. [Physics.]
- a hypothetical particle having no charge, zero spin, and small mass: postulated in some forms of quantum chromodynamics.
- perh. axi(al current) + -on1 1978
'axion' also found in these entries (note: many are not synonyms or translations):