Rosetta stoneRo·set·ta stone
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
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.
- A large inscribed stone found near Rosetta, Egypt, in 1799; later used as a basis for understanding many previously undecipherable examples of hieroglyphic writing.
- (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.