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thoracolumbar
thoracotomy
thorax
Thorazine
thoria
thorianite
thorite
thorium
thorium dioxide
thorium series
thorn
thorn apple
thornback
thornbill
thorny
thorny devil
thoron
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thorium dioxide
tho·ri·um di·ox·ide


noun 
Definition:
 
white powder containing thorium: an insoluble white powder. Use: catalyst, manufacture of gas mantles, refractories, ceramics, optical glass. ThO2
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