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rock oil

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rock oil

–noun
petroleum.

Origin:
1660–70; trans. of ML petroleum
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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rock oil  
n.   Chiefly British
Petroleum.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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