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heavy oil

noun
  1. a hydrocarbon mixture, heavier than water, distilled from coal tar
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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

Examples from the Web for heavy oil

Historical Examples

  • The motive power on the surface was a heavy-oil engine of 250 H.-P.

    Aircraft and Submarines

    Willis J. Abbot.

  • She is propelled on the surface by (usually) heavy-oil Diesel engines.