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A rare white earthy substance, consisting of the oxide of thorium; -- formerly called also thorina.

Of or pertaining to an author. "The authorial Hare.

Authorial. [R.] Cowper.

Any earthy-looking metallic oxide, as alumina, glucina, zirconia, yttria, and thoria.

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.

mixture of air and gas or vapor is employed to heat to incandescence a mantle composed of thoria and ceria. The mantle is made by soaking a "stocking" in a solution of nitrates of thorium and cerium (approx. 99 : 1), drying, and, for use, igniting to burn the thread and convert the nitrates into oxides, which remain as…