oil slick 
noun
A film or layer of oil floating on an expanse of water.Four miles from Kilkeel off the coast of County Down in Northern Ireland, there is a fresh oil slick on the water....
- Just when it looked like it might be safe to go back in the water, an oil slick washed up on the beach.
- At approximately two o'clock in the afternoon the PSC fishermen and their boat captain noticed a large amount of debris and an oil slick in the waters where they were fishing.
- biohacking
- biohazard
- biohazardous
- bioherm
- biohermal
- bioidentical
- bioimaging
- bioindicator
- bioindustry
- bioinformatic
- bioinformatician
- bioinformaticist
- bioinformatics
- bioinorganic
- bioinsecticide
- bio-inspired
- bioinstrumentation
- bio-intensive
- bioinvader
- bioinvasion
- biokinetic
- biokinetics
- Bioko
- biol.
- bioleaching