Dictionary
tho•ri•a
Pronunciation: (thôr'ē-u, thōr'-), [key]—
n. Chem.
a white, heavy, water-insoluble powder, ThO
2, used chiefly in incandescent mantles, as the Welsbach gas mantle. Also called
tho'rium ox'ide, tho'rium diox'ide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.