tuning-fork

tuning fork

noun
a steel instrument consisting of a stem with two prongs, producing a musical tone of definite, constant pitch when struck, and serving as a standard for tuning musical instruments, making acoustical experiments, and the like.

Origin:
1765–75

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World English Dictionary
tuning fork
 
n
a two-pronged metal fork that when struck produces a pure note of constant specified pitch. It is used to tune musical instruments and in acoustics

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

tuning fork
1799, from gerundive of tune (v.) + fork. Invented 1711 by John Shore.
Online Etymology Dictionary, © 2010 Douglas Harper
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