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thoracic duct
thoraco-
thoracolumbar
thoracotomy
thorax
Thorazine
thoria
thorianite
thorite
thorium
thorium dioxide
thorium series
thorn
thorn apple
thornback
thornbill
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thorite
tho·rite [ tháw rt ]


noun 
Definition:
 
radioactive mineral: a rare brown, black, or yellow radioactive thorium silicate mineral. Use: source of thorium.
[Mid-19th century. <Thor]
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