Meaning of double flat

dou'ble flat'

Pronunciation: [key]
— Music. Music.
  1. a symbol (&dblflat;) that lowers the pitch of the note following it by two semitones.
  2. a note or tone marked or affected by such a symbol.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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