Pillowcase (noun)

A protective cover for a pillow, typically made of cloth or other soft material.

Origin:

Pillowcase is a compound word made up of the words "pillow" and "case." the word "pillow" comes from the middle english word "pilwe," which means a cushion or pad, while the word "case" comes from the old english word "cas," which means a container.

Examples:

1. I need to buy a new pillowcase because mine is stained.
2. The hotel provided us with clean pillowcases every day.
3. I like to use satin pillowcases because they make my hair less frizzy.
4. I made a pillowcase out of an old t-shirt.
5. I woke up with a crick in my neck because I slept on a pillowcase that was too thin.