Rosetta Stone

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The Rosetta Stone.

Proper noun[edit]

Rosetta Stone

  1. A large inscribed stone found near Rosetta, Egypt, in 1799; later used as a basis for understanding many previously undecipherable examples of hieroglyphic writing.
  2. (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.