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Rosetta stone

Rosetta stone

 
pronunciation:
ro ze t ston
part of speech: noun
definition 1: an inscribed stone tablet found near Rosetta, Egypt, in 1799 that bears parallel legends in Greek as well as ancient Egyptian hieroglyphic and demotic scripts, thus enabling the first deciphering of Egyptian hieroglyphics.
definition 2: anything that serves as a key to transcription, translation, or some previously indecipherable mystery.