Pitch provider

Wiktionary Word definitions in Wiktionary
n. (context musici English) A fork-shaped object which emits a tone of a specific frequency when struck.

WordNet Word definitions in WordNet
n. a metal implement with two prongs that gives a fixed tone when struck; used to tune musical instruments

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Tuning \Tun"ing\, a. & n. from Tune , v. Tuning fork (Mus.), a steel instrument consisting of two prongs and a handle, which, being struck, gives a certain fixed tone. It is used for tuning instruments, or for ascertaining the pitch of tunes.

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ A gravitational wave at the natural frequency for longitudinal oscillations of the bar would set it ringing like a tuning fork . ▪ Delaney's bomb had shaken through the ship, vibrating the steel like a tuning fork . ▪ Didymograptus ...

Wikipedia Word definitions in Wikipedia
A tuning fork is an acoustic resonator in the form of a two-pronged fork with the prongs ( tines ) formed from a U-shaped bar of elastic metal (usually steel ). It resonates at a specific constant pitch when set vibrating by striking it against a surface ...