ค้นหาอัตโนมัติโดยใช้ *atomic number 86*
WordNet (3.0) WordNet (3.0)
(n) a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health, Syn. Rn, atomic number 86
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