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thoracotomy
thorax
Thorazine
thoria
thorianite
thorite
thorium
thorium dioxide
thorium series
thorn
thorn apple
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thorium series
tho·ri·um se·ries


noun 
Definition:
 
radioactive decay series: one of the natural radioactive decay series that shows how the unstable isotope thorium-232 changes by stages into the stable isotope lead-208
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