Definition of bel noun from the Oxford Advanced Learner's Dictionary

 

bel

 noun
noun
BrE BrE//bel//
 
; NAmE NAmE//bel//
 
(specialist)
 
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a measurement of sound equal to 10 decibels Word Origin 1920s: from the name of A. G. Bell (1847-1922), who invented the telephone and the gramophone.
See the Oxford Advanced American Dictionary entry: bel

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