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English definition of “oil slick”

oil slick

noun [C]    
a layer of oil that is floating over a large area of the surface of the sea, usually because an accident has caused it to escape from a ship or containerEnvironmental issuesRubbish and wasteProtection and protectorsCoverings and layers
(Definition of oil slick noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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