Thorium

['θɔːrɪəm] or ['θɔrɪəm]

解释:

(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.

录入:萨姆纳--From WordNet

解释:

(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.

克莉丝汀编辑

解释:

n. a rare metal resembling aluminium but taking fire below a red heat and burning with great brilliancy.—Also Thorī′num.

校对:米利森特