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-thon
thong
Thor
thoracentesis
thoraces
thoracic
thoracic duct
thoraco-
thoracolumbar
thoracotomy
thorax
Thorazine
thoria
thorianite
thorite
thorium
thorium dioxide
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thoron
tho·ron [ tháw ròn ]


noun 
Definition:
 
radioactive isotope of radon: a radioactive isotope of radon with a half-life of 55 seconds, formed by the radioactive decay of thorium
[Early 20th century. <thorium, after radon]
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