pillowcase

noun
UK /ˈpɪləʊkeɪs/
US /ˈpɪloʊkeɪs/

A soft cloth bag that you put over your pillow to keep it clean.

She washed her pillowcase before going to bed.


OTHER MEANINGS

2. A removable fabric cover used to protect a decorative cushion.

The sofa cushions had bright yellow pillowcases.

3. A protective fabric sleeve for a small padded support.

He changed the pillowcase on the neck pillow.

4. A decorative fabric cover for a throw pillow.

The pillowcase matched the curtains in the living room.