Etymology
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petroglyph (n.)

"carving on or in stone, a rock-carving," usually a prehistoric one, 1854, from French pétroglyphe, from Greek petra "rock" (which is of unknown origin) + glyphē "carving" (from PIE root *gleubh- "to tear apart, cleave"). An earlier word was petrograph (1810). Related: Petroglyphic.

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Definitions of petroglyph

petroglyph (n.)
a carving or line drawing on rock (especially one made by prehistoric people);
From wordnet.princeton.edu