tho·ron 
(thôrŏn′)
(thôrŏn′)n.
A radioactive isotope of radon, Rn-220, having a half-life of 54.5 seconds and produced by the disintegration of thorium.
[THOR(IUM) + -ON2.]
- solicitation
- solicitor
- solicitor general
- solicitous
- solicitously
- solicitousness
- solicitude
- solid
- solid angle
- solidarity
- solid geometry
- solidi
- solidification
- solidify
- solidity
- solidly
- solidness
- solid of revolution
- solid propellant
- solid solution
- solid-state
- solid-state drive
- solid-state physics
- solidus
- solifluction