petro-

petro-

1
a combining form meaning “rock,” “stone,” used in the formation of compound words: petrology.
Also, petri-; especially before a vowel, petr-.


Origin:
< Greek, combining form of pétra rock, pétros a stone

Dictionary.com Unabridged

petro-

2
a combining form meaning “petroleum,” “the extraction and export of petroleum,” used in the formation of compound words: petrochemistry; petropower.

Origin:
extracted from petroleum

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
petro- or (before a vowel) petr-
 
combining form
1.  indicating stone or rock: petrology
2.  indicating petroleum, its products, etc: petrochemical
3.  of or relating to a petroleum-producing country: petrostate
 
[from Greek petra rock or petros stone]
 
petr- or (before a vowel) petr-
 
combining form
 
[from Greek petra rock or petros stone]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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