Hypertext Webster Gateway: "alumina"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Alumina \A*lu"mi*na\, n. [L. alumen, aluminis. See {Alum}.]
(Chem.)
One of the earths, consisting of two parts of aluminium and
three of oxygen, {Al2O3}.
Note: It is the oxide of the metal aluminium, the base of
aluminous salts, a constituent of a large part of the
earthy siliceous minerals, as the feldspars, micas,
scapolites, etc., and the characterizing ingredient of
common clay, in which it exists as an impure silicate
with water, resulting from the decomposition of other
aluminous minerals. In its natural state, it is the
mineral corundum.
From WordNet (r) 1.7 (wn)
alumina
n : any of various forms of aluminum oxide occurring naturally
as corundum [syn: {aluminum oxide}, {aluminium oxide}]
Additional Hypertext Webster Gateway Lookup
Gateway by dict@stokkie.net
stock only wrote the gateway and does not have any control over the contents;
see the Webster Gateway FAQ,
and also the Back-end/database links and credits.