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tuning fork
Longman Dictionary of Contemporary English
tuning fork
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 species of this type have a distinctive shape like a tuning fork.
▪ I trembled like a tuning fork, but my shoulder fakes absorbed the worst of the shaking.
The Collaborative International Dictionary
Tuning fork

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.

Wiktionary
tuning fork

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

WordNet
tuning fork

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

Wikipedia
Tuning fork

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 or with an object, and emits a pure musical tone after waiting a moment to allow some high overtones to die out. The pitch that a particular tuning fork generates depends on the length and mass of the two prongs. It is frequently used as a standard of pitch to tune musical instruments.

The tuning fork was invented in 1711 by British musician John Shore, Sergeant Trumpeter and Lutenist to the court.