Db

Multiple Entries:
  Db    dB    decibel    dubnium  

Concise Oxford English Dictionary © 2008 Oxford University Press:
Db

▶symbol the chemical element dubnium.

Concise Oxford English Dictionary © 2008 Oxford University Press:
dB

▶abbreviation decibel(s).

Concise Oxford English Dictionary © 2008 Oxford University Press:
decibel /ˈdɛsɪbɛl/ (abbrev.: dB)

▶noun a unit of measurement expressing the intensity of a sound or the power of an electrical signal, equal to one tenth of a bel.

Concise Oxford English Dictionary © 2008 Oxford University Press:
dubnium /ˈdʌbnɪəm/

▶noun the chemical element of atomic number 105, a very unstable element made by high-energy atomic collisions. (Symbol: Db)

– origin 1990s: mod. L., from Dubna in Russia, site of the Joint Nuclear Institute.