JMdict: 1805710

快音 【かいおん】

  1. [n] pleasant sound; pleasing sound; crack (of a baseball bat); (pleasant) roar (of an engine)
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
快 Cheerful, Pleasant, Agreeable, Comfortable カイ こころよ.い
音 Sound, Noise オン, イン, -ノン おと, ね