Jisho

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Noun
1. tone holeMusic, See also トーンホール
Wikipedia definition
2. Tone holeA tone hole is an opening in the body of a wind instrument which, when covered by a key, alters the pitch of the sound produced. The resonant frequencies of the an air column in a pipe are inversely proportional to the pipe's effective length. For a pipe with no tone holes, the effective length is the physical length plus corrections for end effects. A shorter pipe, in other words, produces higher notes.
Read “Tone hole” on English Wikipedia
Read “音孔” on Japanese Wikipedia
Read “Tone hole” on DBpedia
Other forms
音孔 【おんこう】

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