gibbs·ite \ˈgibˌzīt\noun (-s) Etymology: George Gibbs died 1833 American mineralogist + English -ite : a mineral Al(OH)3 consisting of light-colored translucent aluminum hydroxide occurring as monoclinic crystals and also in stalactitic and spheroidal forms • gibbs·it·ic\(ˈ)gib|zid.ik\adjective