Hypertext Webster Gateway: "Petrography"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Petrography \Pe*trog"ra*phy\, n. [Petro + -graphy.]
1. The art of writing on stone.
2. The scientific description of rocks; that department of
science which investigates the constitution of rocks;
petrology.
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