pitch pipe

noun
  1. a small flute or reed pipe producing one or more pitches when blown into, used chiefly for establishing the proper pitch in singing or in tuning a musical instrument.

Origin of pitch pipe

First recorded in 1705–15
Also called tuning pipe.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for pitch pipe

pitch pipe

noun
  1. a small pipe, esp one having a reed like a harmonica, that sounds a note or notes of standard frequency. It is used for establishing the correct starting note for unaccompanied singing
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012