Definition of tuning fork noun from the Oxford Advanced Learner's Dictionary

 

tuning fork

 noun
noun
BrE
 
; NAmE
 
 
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a small metal instrument with two long parts joined together at one end, that produces a particular musical note when you hit it and is used in tuning musical instruments More Like This Compound nouns with –ing forms airing cupboard, answering machine, asking price, baking powder, betting shop, boarding school, booking office, bowling alley, breathing space, breeding ground, changing room, clotting factor, cutting room, draining board, drinking water, eating apple, housing estate, icing sugar, living room, meeting place, nursing home, punching bag, racing car, sleeping pill, starting point, tuning fork, waiting room, working partySee worksheet.
See the Oxford Advanced American Dictionary entry: tuning fork