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thoroughpin
thoroughwort
thorp
those
Thoth
thou (1)
thou (2)
thoub
though
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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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