thorium

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tho·ri·um

 (thôr′ē-əm)
n. Symbol Th
A radioactive silvery-white metallic element that is recovered commercially from monazite. Its longest-lived isotope, the only one that occurs naturally, is Th-232 with a half-life of 14.1 billion years and is used as a nuclear fuel. Thorium is used in magnesium alloys, and its oxide is widely used in gas mantles of Welsbach burners. Atomic number 90; atomic weight 232.038; melting point 1,750°C; boiling point 4,788°C; specific gravity 11.72; valence 4. See Periodic Table.

[After Thor.]

thorium

(ˈθɔːrɪəm)
n
(Elements & Compounds) a soft ductile silvery-white metallic element. It is radioactive and occurs in thorite and monazite: used in gas mantles, magnesium alloys, electronic equipment, and as a nuclear power source. Symbol: Th; atomic no: 90; atomic wt: 232.0381; half-life of most stable isotope, 232Th: 1.41 × 1010 years; valency: 4; relative density: 11.72; melting pt: 1755°C; boiling pt: 4788°C
[C19: New Latin, from Thor + -ium]
ˈthoric adj

tho•ri•um

(ˈθɔr i əm, ˈθoʊr-)

n.
a grayish white, lustrous, radioactive metallic element: used as a source of nuclear energy, in sun-lamp and vacuum-tube filaments, and in alloys. Symbol: Th; at. wt.: 232.038; at. no.: 90; sp. gr.: 11.7.
[< Swedish (1829); see Thor, -ium2]
thor•ic (ˈθɔr ɪk, ˈθɒr-) adj.

tho·ri·um

(thôr′ē-əm)
Symbol Th A silvery-white, radioactive metallic element of the actinide series. It is used for fuel in some nuclear reactors and for improving the high-temperature strength of magnesium alloys. The only naturally occurring isotope of thorium is also its most stable, having a half-life of 14 billion years. Atomic number 90. See Periodic Table.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.thorium - a soft silvery-white tetravalent radioactive metallic elementthorium - 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
metal, 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
Translations
торий
thorium
thorium
torio
toorium
torium
תוריום
torij
tórium
þórín
トリウム
thorium
toris
thorium
thorium
torij
torium
toryum

thorium

[ˈθɔːrɪəm] Ntorio m

thorium

n (Chem) → Thorium nt