aluminosilicatePronunciation: /əˌluːmɪnə(ʊ)ˈsɪlɪkeɪt/Definition of aluminosilicate noun Chemistry a silicate in which aluminium replaces some of the silicon, especially a rock-forming mineral such as a feldspar or a clay mineral. aluminosilicate in other Oxford dictionaries Definition of aluminosilicate in the US English dictionary