Definition from Wiktionary, the free dictionary
- Any metal that has a specific gravity greater than about 5, especially one, such as lead, that is poisonous and may be a hazard in the environment.
- (music) A genre descended from rock music, characterized by massive sound, highly amplified distortion, and overall loudness, often with extended guitar solos, complex song structures, fast emphatic beats, and lyrics that involve violent or fantastic imagery.
type of metal
type of music
See also 
heavy metal m (invariable)