Aluminate

noun

1. A chemical compound containing aluminum as part of a negative ion.
2. To treat or impregnate with alum; specifically, in printing engravings, to wash (the paper) with alum-water to prevent the running of the lines.
3. A salt in which alumina acts toward the stronger bases as an acid. Sodium aluminate is used as a mordant. The mineral spinel is a magnesium aluminate.
4. A compound formed from the hydrate of aluminium by the substitution of a metal for the hydrogen.
5. A compound, containing aluminium and oxygen with more electropositive elements, that is a salt of the hypothetical aluminic acid