A bed frame is a structure that supports a mattress and helps to keep it in place. It usually consists of a metal or wooden framework that holds the mattress off the floor and provides stability to the bed. Full definition
This iron queen size bed frame is available as a complete canopy set and 4 - poster bed. (stonecountyironworks.com)
Industry officials have found that in many cases a bed rail was paired with a mattress or bed frame from different manufacturers. (myvirginiainjurylawyer.com)
I know quite a few families who have a room of mattresses on the floor or a room of mattresses on metal bed frames! (themilkmeg.com)