petrography

1 of 2

noun

: the description and systematic classification of rocks

petrographic

2 of 2

adjective

variants or petrographical
: of or relating to petrography
petrographically adverb

Word History

Etymology

Noun

petro- + -graphy

Adjective

petrographic probably from (assumed) New Latin petrographicus, from New Latin petrographia petrography + Latin -icus -ic; petrographical from New Latin petrographia + English -ical

First Known Use

Noun

1651, in the meaning defined above

Time Traveler
The first known use of petrography was in 1651

Browse Nearby Words

Cite this Entry

“Petrography.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/petrography. Accessed 15 Jul. 2026.

More from Merriam-Webster on petrography

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!