Headphone
ahd-5
noun.
A small speaker that is worn over or in the ear, often as one of a pair connected by a wire attached to a band running over the head
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
A listening device placed or worn in the ear, usually sold in pairs
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear