head·phone

[hed-fohn]
noun Usually, headphones.
1.
Audio. a headset designed for use with a stereo system.
2.
any set of earphones.

Origin:
1910–15; head + -phone

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To headphone
Encyclopedia Britannica
Encyclopedia

headphone

small loudspeaker (earphone) held over the ear by a band or wire worn on the head. Headphones are commonly employed in situations in which levels of surrounding noise are high, as in an airplane cockpit, or where a user such as a switchboard operator needs to keep the hands free, or where the listener is moving about or wants to listen without disturbing other people. A headphone may be equipped with one earphone or two and may include a miniature microphone, in which case it is called a headset. For listening to stereophonically reproduced sound, stereo headphones may be used, with separate channels of sound being fed to the two earphones.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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00:10
Headphone is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Example sentences
Surround sound requires appropriate amplifier and loudspeakers or headphone.
Pulls double duty as portable and home-stereo headphone solution.
Surround sound requires appropriate player, amplifier, and loudspeakers or
  headphone.
They prefer to use the volume amplification of the radio headphone.
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