An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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decibel (dB)
  دسی‌بل  
desibel (#)
Fr.: décibel  

A dimensionless unit used to express relative difference in power or intensity, usually between two acoustic or electric signals. It is defined as n [dB] = 10 log (P1/P0),
with → natural logarithm. One decibel equals one-tenth of a → bel (B).

See also: → deci-; → bel (B).