oil slick

Definitions

General English

  • noun a layer of oil which has spilled into the sea from a tanker or oil rig and which floats on the water

General Science

  • noun oil which has escaped into water and floats on the surface

Military

  • noun a large patch of oil or petroleum floating on water (usually released from a damaged ship as a result of an accident or enemy action)
http://www.dictionarycentral.com/definition/oil-slick.html