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.]
- receptively
- receptiveness
- receptivity
- receptor
- receptor modulator
- recertification
- recertify
- recess
- recess appointment
- recession
- recession
- recessional
- recessionary
- analytic
- analytical
- analytical balance
- analytically
- analytic function
- analytic geometry
- analytic philosophy
- analytic psychology
- analytics
- analyzable
- analyzation
- analyze