1. a support for the head, typically attached to the back of a seat or chair
2. a cushioned or padded support attached to the top of a car seat to prevent neck injury in a collision

Examples

• The airplane seat had an adjustable headrest for passenger comfort.
• She adjusted the headrest in her car before driving on the highway.
• The dentist's chair includes a padded headrest to support patients during procedures.
• Modern car headrests are designed to reduce whiplash injuries.
• The office chair's headrest helped reduce neck strain during long work sessions.
• He leaned back against the headrest and closed his eyes.
• The headrest on the barber's chair was covered in soft leather.