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Petrarchan sonnet
petrel
petri-
Petri dish
petrifaction
Petrified Forest National Park
petrify
Petrine
petro-
petrochemical
petrochemistry
petrodollar
petrogenesis
petroglyph
Petrograd
petrography
petrol
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petro-
petro-


prefix 
Definition:
 
1. rock, stone
petrography
2. petroleum
petrodollar
[< Greek petros "stone," petra "rock"]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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