Heavy metal Meaning, Definition & Usage
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noun a metal of relatively high density (specific gravity greater than about 5) or of high relative atomic weight (especially one that is poisonous like mercury or lead)
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noun loud and harsh sounding rock music with a strong beat; lyrics usually involve violent or fantastic imagery
heavy metal music.
WordNet
Definitions
(Mil.) , large guns carrying balls of a large size; also, large balls for such guns.a type of rock music (1970's), with a hard beat, amplified electronically