- any metal with a specific gravity of 5.0 or greater, especially one that is toxic to organisms, as lead, mercury, copper, and cadmium.
- aggressive and heavily amplified rock music, commonly performed by groups that wear spectacular or bizarre costumes.
- a type of rock music characterized by a strong beat and amplified instrumental effects, sometimes with violent, or nihilistic lyrics
- (as modifier)a heavy-metal band
- a metal with a high specific gravity
- military large guns or shot