Rosetta-stone meaning

rō-zĕtə
A basalt tablet bearing inscriptions in Greek and in Egyptian hieroglyphic and demotic scripts that was discovered in 1799 near Rosetta, a town of northern Egypt in the Nile River delta, and provided the key to the decipherment of Egyptian hieroglyphics.
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A tablet of gray granite found in 1799 at Rosetta, a town in Egypt: because it bore parallel inscriptions in Greek and in ancient Egyptian demotic and hieroglyphic characters, it provided a key to the deciphering of ancient Egyptian writing.
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A large inscribed stone found near Rosetta, Egypt, in 1799; later used as a basis for understanding many previously undecipherable examples of hieroglyphic writing.
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(hence) Any source of information crucial to interpreting.

My friend’s carefully-compiled notebook was the Rosetta Stone that opened understanding of the physics lectures.

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