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WordReference Random House Unabridged Dictionary of American English © 2024petr-, - Rocksvar. of petro- 1 before a vowel:petrous.
WordReference Random House Unabridged Dictionary of American English © 2024pet•ro (pe′trō),USA pronunciation adj. - of or pertaining to petroleum or the petroleum industry.
n. - British Terms[Canadian.]the federally owned petroleum industry.
- independent use of petro-2 1970–75
: - a combining form meaning "rock,'' "stone,'' used in the formation of compound words:petrology.
Also, petri-;
[esp. before a vowel,] petr-. - Greek, combining form of pétra rock, pétros a stone
: - a combining form meaning "petroleum,'' "the extraction and export of petroleum,'' used in the formation of compound words:petrochemistry; petropower.
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