(sciences, countable) 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.

(informal) Resembling or characteristic of heavy metal music.

plural of heavy metal

An umlaut over a letter in the name of a heavy metal band (as in "Motörhead", "Queensrÿche" and "Mötley Crüe"), added gratuitously for mere stylistic effect.

plural of heavy metal umlaut