| NOUN | substance | rock wool, mineral wool | a light fibrous material used as an insulator |
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| Meaning | A light fibrous material used as an insulator. | |
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| Synonym | mineral wool | |
| Broader | insulator, dielectric, nonconductor | A material such as glass or porcelain with negligible electrical or thermal conductivity |
| Spanish | lana de roca | |
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