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mineral wool

noun
1.
a woollike material for heat and sound insulation, made by blowing steam or air through molten slag or rock.
Also called rock wool.
Origin
1880-1885
1880-85
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for mineral-wool

mineral wool

noun
1.
a fibrous material made by blowing steam or air through molten slag and used for packing and insulation Also called rock wool
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Value for mineral

9
12
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