heavy-metal

heavy metal

noun
1.
any metal with a specific gravity of 5.0 or greater, especially one that is toxic to organisms, as lead, mercury, copper, and cadmium.
2.
aggressive and heavily amplified rock music, commonly performed by groups that wear spectacular or bizarre costumes.

Origin:
1860–65, for literal sense

heav·y-met·al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Heavy-metal is always a great word to know.
So is flibbertigibbet. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a chattering or flighty, light-headed person.
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