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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.
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Origin of mineral wool

First recorded in 1880–85
Also called rock wool.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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 insulationAlso called: rock wool
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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