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oil slick

American  

noun

  1. a smooth area on the surface of water caused by the presence of oil.


oil slick British  

noun

  1. a mass of floating oil covering an area of water, esp oil that has leaked or been discharged from a ship

"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

Etymology

Origin of oil slick

First recorded in 1885–90