petrography

noun
pe·trog·ra·phy | \ pə-ˈträ-grə-fē , pe- \

Definition of petrography 

: the description and systematic classification of rocks

Other words from petrography

petrographer \pə-ˈträ-grə-fər, pe- \ noun
petrographic \ˌpe-trə-ˈgra-fik \ or petrographical \ˌpe-trə-ˈgra-fi-kəl \ adjective
petrographically \ˌpe-trə-ˈgra-fi-k(ə-)lē \ adverb

First Known Use of petrography

1651, in the meaning defined above

History and Etymology for petrography

New Latin petrographia, from petr- + Latin -graphia -graphy

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The first known use of petrography was in 1651

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Britannica.com: Encyclopedia article about petrography

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occurring twice a year or every two years

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