Th, n.
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>
Th atomic number 90 thorium
lexical pointers
derivationally related form
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hypernym
substance holonym
hyponym
the fifth day of the week; the fourth working day
<noun.time>
Th Thursday
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hypernym