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THORIUM
thorium, Th, atomic number
(noun) 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
Source: WordNet® 3.1
Etymology
Noun
thorium (uncountable)
A chemical element (symbol Th) with atomic number 90: a weakly radioactive, malleable, moderately hard silvery metal that tarnishes black when exposed to air.
Synonyms
• thorinum (former alternative form; obsolete)
Source: Wiktionary
Tho"ri*um, n. Etym: [NL. See Thorite.] (Chem.)
Definition: A metallic element found in certain rare minerals, as thorite, pyrochlore, monazite, etc., and isolated as an infusible gray metallic powder which burns in the air and forms thoria; -- formerly called also thorinum. Symbol Th. Atomic weight 232.0.
Source: Webster’s Unabridged Dictionary 1913 Edition
Recent Word Finds
Word of the Day
23 November 2024
THEORETICAL
(adjective) concerned primarily with theories or hypotheses rather than practical considerations; “theoretical science”
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