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thoracic
thoracic duct
thoraco-
thoracolumbar
thoracotomy
thorax
Thorazine
thoria
thorianite
thorite
thorium
thorium dioxide
thorium series
thorn
thorn apple
thornback
thornbill
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thorianite
tho·ri·an·ite [ tháwree ə nt ]


noun 
Definition:
 
black radioactive mineral: a rare black radioactive mineral that is an oxide of thorium mixed with rare-earth metals. Use: source of thorium and uranium.
[Early 20th century. <thoria + -ite1]
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