Longman Dictionary of Contemporary English
four-poster bed
noun
EXAMPLES FROM CORPUS
▪ A four-poster bed absorbed the remainder.
▪ A magnificent four-poster bed dominates this room.
▪ Nina was half-hidden under a four-poster bed, trailing silk sheets behind her like a bridal train.
▪ Past the piano was a stairway leading to nowhere, and then a four-poster bed, forlorn but inviting.
▪ The green fireplace, with the black clock with angels, the dressing-table and figured mirror, the four-poster bed.
▪ The honeymoon suite has a four-poster bed trimmed with lace.
▪ This large house, thoroughly modernized, is furnished with period pieces including a four-poster bed.
Wikipedia
Four-poster bed
A four-poster bed is a bed with four vertical columns, one in each corner, that support a tester, or upper (usually rectangular) panel. This tester or panel will often have rails to allow curtains to be pulled around the bed. There are a number of antique four-poster beds extant dating to the 16th century and earlier; many of these early beds are highly ornate and are made from oak. An example of such an early 16th-century four-poster resides in Crathes Castle, which was made for the original castle owners in the Burnett of Leys family.