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: T Tæ Tê T- T. Ta Tb Tc Td Te Th Ti Tj Tk Tl Tm Tn To Tp Tr Ts Tt Tu Tv Tw Tx Ty Tz

Table of Contents POS
HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

thorium

POS

Noun

HYPHEN

tho=ri=um

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WORDNET DICTIONARY

Noun thorium has 1 sense

thorium(n = noun.substance) atomic number 90, th - 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; Array

is a kind of metal, metallic element

has particulars: radiothorium, thorium-228

Derived form verb thoriate₁

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CIDE DICTIONARY

thorium, n. [NL. See Thorite.].

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. [1913 Webster]

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OXFORD DICTIONARY

thorium, n. Chem. a radioactive metallic element occurring naturally in monazite, the oxide of which is used in gas-mantles.

Usage

Symb.: Th.

Etymology

Thor, Scand. god of thunder

For further exploring for "thorium" in Webster Dictionary Online