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axle
axlebox
axletree
axman
Axminster
axolemma
axolotl
axon
axoneme
axonometric
axoplasm
ay (1)
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Ayacucho
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axion
ax·i·on [ áksee òn ] (plural ax·i·ons)


noun 
Definition:
 
hypothetical subatomic particle: a hypothetical subatomic particle that has small mass, zero spin, and no electrical charge
[Late 20th century. <axial + content1]
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