Mattress

Definitions

1. A pad on which a person can recline and sleep, usually having an inner section of coiled springs covered with foam or other cushioning material then enclosed with cloth fabric.
2. A form of retaining wall used to support foundations or an embankment
3. A form of lagging, in particular for boilers.

Equivalents

Examples

“Spun glass mattresses are used for lagging the boiler, which has three Ross pop safety valves on the front ring⟳.”

“The boiler and firebox are lagged with a lightweight Fibreglass mattress.”

CEFR level