- spun glass similar to wool, used for insulation, filters, etc.
Origin of glass wool
First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for glass wool
Historical Examples of glass wool
The gas loses its conductivity when filtered through a plug of glass-wool, or when it is made to bubble through water.
- fine spun glass massed into a wool-like bulk, used in insulation, filtering, etc
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