A heavy and intense form of heavy metal music with a focus on speed, technical precision, alternate picking, extended guitar solos, and often having aggressive lyrics.

A brass alloy consisting of copper (55%), zinc (41-43%) and iron (1-3%), with the balance consisting of various other metals. The proportions used make the material harder and suitable for valves and bearings.

An alloy with high magnetic permeability, consisting of nickel (77%) and iron (15%) with traces of copper and molybdenum.

(chemistry) any compound in which hydrogen is bonded chemically to a metal or metalloid element

(chemistry) Any complex of a transition metal combined with carbon monoxide; they are typically volatile solids or liquids, soluble on common organic solvents but insoluble in water; they are highly toxic.

(physics) Any substance that acts as a conductor to electrons of one spin orientation, but as an insulator to those of the opposite orientation

(inorganic chemistry, alchemy) A metal resistant to corrosion, oxidizing and tarnishing, such as gold, platinum, copper and mercury.

(chemistry, obsolete) Any metal, such as gold or silver, not readily oxidized by heat and air.

Any of various metallic elements in the p-block of the periodic table, generally with higher electronegativity, lower melting and boiling points and greater softness than the transition metals.

(archaeology) An age characterised by the use of tools made from a specific type of metal.