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Meaning of Stymphalian birds

Stym•pha'li•an birds'

Pronunciation: (stim-fā'lē-un, -fāl'yun), [key]
— Class. Myth. Class. Myth.
  1. a flock of predacious birds of Arcadia that were driven away and killed by Hercules as one of his labors.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.