| Answer | Crossword Clue |
|---|---|
| thorias | THORIA, an oxide of thorium |
| thoria | an oxide of thorium |
| thorianite | a strongly radioactive mineral that is an oxide of thorium |
| thorianites | THORIANITE, a strongly radioactive mineral that is an oxide of thorium |
| thoria | a powdery white oxide of thorium ThO2 used especially as a catalyst and in crucibles and refractories and optical glass |
