Dictionary  Roset'ta stone"1. a stone slab, found in 1799 near Rosetta, bearing parallel inscriptions in Greek, Egyptian hieroglyphic, and demotic characters, making possible the decipherment of ancient Egyptian hieroglyphics. 2. a clue, breakthrough, or discovery that provides crucial knowledge for the solving of a puzzle or problem. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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