- a woollike material for heat and sound insulation, made by blowing steam or air through molten slag or rock.
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
- a fibrous material made by blowing steam or air through molten slag and used for packing and insulationAlso 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