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ATOMIC NUMBER 90
I. (noun)
Sense 1
Meaning:
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
Synonyms:
Classified under:
Hypernyms ("atomic number 90" is a kind of...):
metal; metallic element (any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.)
Hyponyms (each of the following is a kind of "atomic number 90"):
radiothorium; thorium-228 (radioactive isotope of thorium with mass number 228)
Holonyms ("atomic number 90" is a substance of...):
monazite (a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium)
thorite (a radioactive mineral consisting of thorium silicate; it is a source of thorium that is found in coarse granite)
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