rock wool

noun

Origin:
1925–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rock wool
 
n
another name for mineral wool

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Others use slag for rock wool or old newspaper for cellulose insulation.
Rock wool is produced from natural rocks, such as basalt and diabase.
The old rock wool warehouse facility received major irreparable damage.
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