rosetta stone

Noun
  1. A part of an inscribed granite stela that was originally about six feet tall and was set up in 196 BC;
    The inscriptions in hieroglyphics and Demotic and Greek gave the first clues to the decipherment of Egyptian hieroglyphics (synset 106417534)
    is an instance of: stela, stele - an ancient upright stone slab bearing markings

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