thoria
[
thawr
-ee-
uh
,
thohr
-]
/ˈθɔr i ə, ˈθoʊr-/
noun
,
Chemistry
1.
a white, heavy, water-insoluble powder, ThO
2
, used chiefly in incandescent mantles, as the Welsbach gas mantle.
Also called
thorium oxide,
thorium dioxide
.
Origin
1835-45;
thori(um)
+
-a
4
British Dictionary definitions for
thorium dioxide
thorium dioxide
noun
1.
a heavy insoluble white powder used in incandescent mantles. Formula: ThO
2
Also called
thoria
thoria
/
ˈθɔːrɪə
/
noun
1.
another name for
thorium dioxide
Word Origin
C19:
thorium
+
-a,
on the model of
magnesia