A metal is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well.
Material that is typically hard, opaque, shiny, and has good electrical and thermal conductivity.
Element, compound, or alloy that is a good conductor of both electricity and heat
An opaque crystalline material usually of high strength with good electrical and thermal conductivities, ductility and reflectivity.
Any of a number of chemical elements in the periodic table that form a metallic bond with other metal atoms; generally shiny, somewhat malleable and hard, often a conductor of heat and electricity.