a drawing or carving on rock, made by a member of a prehistoric people.
Also called petrograph.

1865–70; < French pétroglyphe. See petro-1, glyph

petroglyphic, adjective
petroglyphy [pi-trog-luh-fee] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
petroglyph (ˈpɛtrəˌɡlɪf)
a drawing or carving on rock, esp a prehistoric one
[C19: via French from Greek petra stone + gluphē carving]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1870, from Fr. pétroglyphe, from Gk. petra "rock" + glyphe "carving."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Then, heading up the canyon, he zigged to a corner to show us a string of
  thousand-year-old petroglyphs.
Petroglyphs are one of the earliest expressions of abstract thinking and are
  considered a hallmark of humanity.
The character of the petroglyphs is essentially savage.
Hiking trails take in ancient petroglyphs, high desert wildlife, and sandstone
  shrine used for meditation and concerts.
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