also: イヤモニター
noun
Wasei-eigo from 'ear monitor'. Refers to the personal monitoring device used by musicians on stage.
wasei-eigo (Japanese-coined English), from ear monitor
ライブでは、ボーカリストはイヤーモニターを使って自分の声を確認する。
During live performances, vocalists use in-ear monitors to check their own voice.
Variant with interpunct.
ヘッドホン are general headphones, while イヤーモニター specifically refers to professional in-ear monitors for stage use.
Wasei-eigo from English 'ear monitor'.