a woollike material for heat and sound insulation, made by blowing steam or air through molten slag or rock. Also called rock wool .
[ 1880-85 ]
a woollike material for heat and sound insulation, made by blowing steam or air through molten slag or rock. Also called rock wool .
[ 1880-85 ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012