| NOUN | substance | glass wool | glass fibers spun and massed into bundles resembling wool |
|---|
| Meaning | glass fibers spun and massed into bundles resembling wool. | |
|---|---|---|
| Broader | filter | device that removes something from whatever passes through it |
| insulator, dielectric, nonconductor | A material such as glass or porcelain with negligible electrical or thermal conductivity | |