noun. ['ˈgæliːəm'] a rare silvery (usually trivalent) metallic element; brittle at low temperatures but liquid above room temperature; occurs in trace amounts in bauxite and zinc ores.
1. Noun, singular or mass He created that laser, and colored it red using gallium arsenide phosphide. 2. Adjective Both MOSFETs and BJTs are generally made from silicon, with a smaller percentage made from gallium arsenide.