tuning fork - definition and synonyms

noun [countable] music 

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/ˈtjuːnɪŋ ˌfɔː(r)k/
singulartuning fork
pluraltuning forks
  1. a metal object that produces a particular note when you hit it, used by someone making small changes to a musical instrument so that it produces the correct note. It has a handle and two long thin parts.