cryptolith
/ˈkrɪptəlɪθ/Definitions
1. noun
A stone monument or memorial, often covered in inscriptions or symbols, typically of prehistoric or ancient origin.
“The village elder pointed to the cryptolith at the edge of the forest, telling the legend of the tribe’s ancestors.”
2. noun
A large stone monument, especially of megalithic construction.
“Archaeologists studied the cryptolith to better understand the culture and technology of the ancient civilization.”