An Etymological Dictionary of Astronomy and Astrophysics

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annihilation operator
  آپارگر ِ نابودی  
âpârgar-e nâbudi
Fr.: opérateur d'annihilation  

In → quantum field theory, the operator that lowers → eigenstates one → energy level, contrarily to the → creation operator.

See also: → annihilation; → operator.