| Th 1 The symbol for the element thorium. |
| Th 2 abbr. 1. Bible Thessalonians 2. Thursday |
Th Chem thorium
| Th The symbol for thorium. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  Th - the fifth day of the week; the fourth working dayweekday - any day except Sunday (and sometimes except Saturday) |
| 2. |  Th - 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 sandsmetal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. radiothorium, thorium-228 - radioactive isotope of thorium with mass number 228 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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