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from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics A
radioactive isotope ofthorium , 22890Th, having ahalf-life of 1.4 x 1010 years; it occurs naturally, and is a source ofnuclear energy
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun radioactive isotope of thorium with mass number 228
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