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tuning fork

noun
1.
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 of tuning fork
1765-1775
1765-75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for tuning fork

tuning fork

noun
1.
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for tuning fork
n.

1799, from gerundive of tune (v.) + fork (n.). Invented 1711 by John Shore.

Online Etymology Dictionary, © 2010 Douglas Harper
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7
11
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