White crystalline mineral consisting of aluminum hydroxide

• A constituent of bauxite and a source of alumina

Wikipedia Word definitions in Wikipedia
Gibbsite , Al(OH), is one of the mineral forms of aluminium hydroxide . It is often designated as γ-Al(OH) (but sometimes as α-Al(OH).). It is also sometimes called hydrargillite (or hydrargyllite). Gibbsite is an important ore of aluminium in that it is ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Gibbsite \Gibbs"ite\, n. [Named after George Gibbs.] (Min.) A hydrate of alumina.

WordNet Word definitions in WordNet
n. white crystalline mineral consisting of aluminum hydroxide; a constituent of bauxite and a source of alumina

Wiktionary Word definitions in Wiktionary
n. (context mineral English) A mineral with monoclinic crystals, usually white but can have different colors, aluminum(oxygenhydrogen) 3 .