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Yours, Etc.: Origins and Uses of 8 Sign-Offs

coal oil

noun, Older U.S. Use and Canadian.
1.
petroleum obtained by the destructive distillation of bituminous coal.
2.
Origin
1855-1860
1855-60, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for coal oil

coal oil

noun
1.
(US & Canadian) petroleum or a refined product from petroleum, esp kerosene
2.
a crude oil produced, together with coal gas, during the distillation of bituminous coal
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 Value for coal

6
8
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