headphone

名词 headphone:

1. electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear
   同义词：earphone, earpiece, phone

head.phone

n.（名词）
A receiver, as for a telephone, radio, or stereo, held to the ear by a headband.
头戴式受话器，耳机：用头环套在耳朵上的用于接收电话、收音机或立体声等的接受器