atomic number 90
English Thesaurus
1. a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands (noun.substance)
| hypernym | : | metal, metallic element, |
| definition | : | any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. (noun.substance) |
| substance meronym | : | monazite, |
| definition | : | a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium (noun.substance) |
| substance meronym | : | thorite, |
| definition | : | a radioactive mineral consisting of thorium silicate; it is a source of thorium that is found in coarse granite (noun.substance) |
| derivation | : | thoriate, |
| definition | : | impregnate with thorium oxide to increase thermionic emission (verb.change) |
| derivation | : | thoriate, |
| definition | : | impregnate with thorium oxide to increase thermionic emission (verb.change) |
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