heavy metal

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.

1860–65, for literal sense

heavy-metal, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
heavy metal
1.  a.  a type of rock music characterized by a strong beat and amplified instrumental effects, sometimes with violent, nihilistic, or misogynistic lyrics
 b.  (as modifier): a heavy-metal band
2.  a metal with a high specific gravity
3.  military large guns or shot

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

heavy metal definition

big iron

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The bigger campsites have generators with projectors with big screens playing
  all sorts of heavy metal music and videos.
Edith suffered from curvature of the spine and was forced to wear a heavy metal
Also, the sulfur and heavy metal is higher than in conventional crude.
Bone loss from ingesting radium is the result of chemical heavy metal
  poisoning, not radiation.
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