Definition of pitch pipe in English:

pitch pipe

noun

Music
  • A small reed pipe or set of pipes blown to set the pitch for singing or tuning an instrument.

    • ‘She held up a small, round, silver box that looked a lot like a pitch-pipe.’
    • ‘This simple pitch pipe features a tough plastic case; metal tubes; and sturdy, tuned reeds for accurate pitch and durability.’

Pronunciation

pitch pipe

/ˈpiCH ˌpīp/