Go to 'thermo-' entry Go to 'dino-' entry Go to 'chondro-' entry Go to 'aero-' entry Go to '-logy' entry Go to 'thaumato-' entry Go to 'nano-' entry Go to '-sophy' entry Go to 'bucco-' entry Go to '-ism' entry Go to '-lysis' entry Go to 'galacto-' entry Go to '-anthropy' entry Go to 'pneumo-' entry Go to '-ploitation' entry Go to '-lithic' entry Go to '-sepalous' entry Go to 'onco-' entry Go to '-parous' entry Go to 'dermato-' entry Go to 'multi-' entry Go to 'dodeca-' entry Go to '-zoon' entry Go to 'vermi-' entry Go to 'crystallo-' entry Go to 'biblio-' entry Go to 'eco-' entry Go to 'juxta-' entry Go to 'facio-' entry
Affixes: the building blocks of English
Affixes: the building blocks of English

petro- Also petri-.

Rocks; petroleum.

[Greek petros, stone, petra, rock.]

To petrify something is literally to turn it into stone, though it is more frequently used figuratively to refer to somebody so frightened that they are unable to move or think; a petroglyph (Greek glyphē, carving) is a rock carving, especially a prehistoric one; petrography is the systematic description of the composition and properties of rocks based on observation; petrology is the study of rocks, including their origins, structure, and composition

Petroleum derives from Latin oleum, oil. A number of terms in petro- refer to petroleum, for example petrochemicals, substances obtained by the refining and processing of petroleum or natural gas, and petrodollar, a notional unit of currency earned by a country from the export of petroleum.

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