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English definition of “sediment”

sediment

noun uk   /ˈsed.ɪ.mənt/ us  
[C or U] a soft substance that is like a wet powder and consists of very small pieces of a solid material that have fallen to the bottom of a liquid: There was a brown sediment in the bottom of the bottle. sediments [plural] sand, stones, etc. that slowly form a layer of rock: It is hoped that the oil slick will sink to the seabed where it would be covered within a few years by sediments and eventually decompose.
sedimentation
noun [U] uk   /ˌsed.ɪ.menˈteɪ.ʃən/ us  
(Definition of sediment from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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