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petro-1

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

petro-2

1.
a combining form meaning “petroleum,” “the extraction and export of petroleum,” used in the formation of compound words:
petrochemistry; petropower.
Origin
extracted from petroleum
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for petro-

petro-

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
Word Origin
from Greek petra rock or petros stone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for petro-

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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petro- in Medicine

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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Difficulty index for petro-

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Word Value for petro

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