Pillow (noun)

1. A cushion placed under the head of a person when sleeping in a bed.
2. A cushion used to support other parts of the body when sitting or lying down.
3. A cushion filled with feathers, down, or foam rubber, used to support the head when lying down.

Origin:

Middle english: from old french peil, from latin pulvinus "cushion".

Examples:

1. He slept on a soft pillow.
2. She had a pillow under her head.
3. The pillow was fluffed up.
4. He had a pillow under his back.
5. She had a pillow under her legs.