From Longman Dictionary of Contemporary Englishheadresthead‧rest /ˈhed-rest/ noun [countable] DHFthe top part of a chair or of a seat in a car, plane etc that supports the back of your head
Examples from the Corpus
headrest• It had a headrest and was studded with buttons made of bone.• A suitcase was on top of her headrest.• His hands over his head, he was pulling the steel headrest, his breath making a low-pitched moaning sound.• Instead, lean back against the headrest.• I cozied my head against the headrest.• She pushed the headrest back up; she pulled the tassel. 