Fipple

n. block of wood in a woodwind musical instrument which directs the flow of air

Fipple mouthpieces are commonly found on end-blown woodwind instruments such as the tin whistle and the recorder. They use a narrow windway and a blade-like edge to channel and vibrate air blown into them. The term fipple properly refers to the block, typically of wood, that forms the floor of the windway.A fipple flute (also called duct flute), in other words, is simply a flute that is played from the top instead of the side.
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Noun
1. a wooden plug forming a flue pipe (as the mouthpiece of a recorder)
(hypernym) plug, stopper, stopple

a word meaning the sharp edge of the lip (of a flute or recorder).

n. จุกไม้อุดปลายบนของปี่, ลิ้นของเครื่องดนตรีประเภทเครื่องเป่า