- 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
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