bedbase

noun
UK /ˈbedbeɪs/
US /ˈbedbeɪs/

The strong flat part under a mattress that holds it up.

We put the new mattress on the wooden bedbase.


OTHER MEANINGS

2. The bottom support structure of a bed, often made of wood or metal.

The metal bedbase creaked whenever he rolled over.

3. A platform or foundation on which a mattress rests, sometimes with storage underneath.

Their bedbase has two big drawers for extra blankets.

4. The lower frame of a hospital or adjustable bed.

The nurse raised the bedbase to make the patient more comfortable.