| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Impregnated timber | Mining | Timber that has been treated either to make it flame resistant or to protect it from destruction by fungi and insects. Cover boards used with steel arches are often vacuum-pressure impregnated with a flame-retardant preservative for safety and to comply with the flame-proofing requirements covering escape roadways. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
