Rosetta Stone Definition

rō-zĕtə
noun
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.
Webster's New World
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pronoun

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

Wiktionary
(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.
Wiktionary
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Rosetta stone