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petrogram

American

[pe-truh-gram] / ˈpɛ trəˌgræm /

noun

a drawing or painting on rock, especially one made by a member of a prehistoric people.

Etymology

Origin of petrogram

petro- ¹ + -gram ¹

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.