Synonyms & Definition of Thorium
From WordNet 2.0 :
Thorium
:
(noun)
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 [syn:
Th
,
atomic number 90
]
Categories
:
Chemical elements
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