plural of petrary

(petrology) The branch of petrology that deals with the scientific description and classification of rocks. / The art of writing on stone.

The process of changing into stone; petrification.

A substance, mostly carbon, that is a byproduct of oil refining; used as a fuel or in many industrial applications.

plural of Petri dish

plural of petrel

A geologist who specializes in petrology.

(geology) The study of the origin, composition and structure of rock.

petroleum ether

petroleum ether / plural of petroleum spirit