Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for thorium from the 1913 edition of Webster's Revised Unabridged Dictionary. Define thorium using one of the most comprehensive free online dictionaries on the web.

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Part of Speech: noun
Results: 1
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.
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