heavy metal

Noun heavy metal has 2 senses

• heavy metal(n = noun.substance) - 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);
is a kind of alloy, metal, metal, metallic element

• heavy metal(n = noun.communication) heavy metal music - loud and harsh sounding rock music with a strong beat; lyrics usually involve violent or fantastic imagery;
is a kind of rock, rock'n'roll, rock-and-roll, rock 'n' roll, rock and roll, rock music