headrest

名词 headrest:

1. a cushion attached to the top of the back of an automobile's seat to prevent whiplash
   同义词：head restraint
2. a rest for the head

head.rest

n.（名词）
A support for the head, as at the back of a chair.
靠头物：如椅背上的头部支持物
A cushion attached to the top of the back of an automotive vehicle`s seat, especially to prevent whiplash.Also called In this sense, also called head restraint
车座枕头：汽车座位上尤用于防止脑震荡的头垫也作 在此意义上也可称作 head restraint