[pe-troh] /ˈpɛ troʊ/

of or relating to petroleum or the petroleum industry.
Canadian. the federally owned petroleum industry.
a combining form meaning “rock,” “stone,” used in the formation of compound words:
a combining form meaning “petroleum,” “the extraction and export of petroleum,” used in the formation of compound words:
petrochemistry; petropower.
combining form
indicating stone or rock: petrology
indicating petroleum, its products, etc: petrochemical
of or relating to a petroleum-producing country: petrostate

before vowels petr-, word-forming element used from 19c., from comb. form of Greek petros “stone,” petra “rock” (see petrous).

word-forming element used from mid-20c. to mean “of or having to do with petroleum products,” from petroleum.

petro- or petri- or petr-
Rock; stone; stone-like hardness: petrous.


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