fittedsheet

noun
UK /ˈfɪtɪd ʃiːt/
US /ˈfɪtɪd ʃiːt/

A fitted sheet is a bed cover with elastic corners that hugs the mattress.

She put a clean fitted sheet on her bed before going to sleep.


OTHER MEANINGS

2. A sheet sewn with elastic corners to stay on a mattress.

The fitted sheet kept slipping off the old mattress.

3. The lower layer of bedding placed directly on the mattress.

Wash the fitted sheet every week for good hygiene.

4. A tailored or shaped sheet rather than a flat one.

Unlike a flat sheet, a fitted sheet has corners that grip.