Definition of Thorium

1. 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.

Exact synonyms: Atomic Number 90, Th
Generic synonyms: Metal, Metallic Element
Specialized synonyms: Radiothorium, Thorium-228
Substance meronyms: Monazite, Thorite
Derivative terms: Thoriate

Definition of Thorium

1. n. 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.

Definition of Thorium

1. a metallic element [n -S]

Medical Definition of Thorium

1. 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. Origin: NL. See Thorite. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Thorium

Thoreau
Thoreauvian
thoria
thoria
thorianite
thorianites
thorias
thoriate
thoriated
thoric
thoric
thorite
thorite
thorites
thorium (current term)
thorium (current term)
thorium-228
thoriums
thorium compounds
thorium dioxide
Thormahlen
Thormahlen's test
thorn
thorn
Thorn's syndrome
thorn-headed
thornback
thornback
thornbacks
thornbill

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