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thorium dioxide
thorium series
thorn
thorn apple
thornback
thornbill
thorny
thorny devil
thoron
thorough
thoroughbass
Thoroughbred
thoroughbred
thoroughfare
thoroughgoing
thoroughpaced
thoroughpin
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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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