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From Longman Dictionary of Contemporary English
Related topics: Geology
sedimentationsed‧i‧men‧ta‧tion /ˌsedəmenˈteɪʃən, -mən-/ noun [uncountable] technical  HEGthe natural process by which small pieces of rock, earth etc settle at the bottom of the sea etc and form a solid layer
Examples from the Corpus
sedimentationBlood tests were normal with the exception of a slightly raised erythrocyte sedimentation rate.Data in the Table show that the scan score correlated significantly with all laboratory measurements except the erythrocyte sedimentation rate.The scan score correlated with all laboratory tests generally accepted to reflect active gut inflammation except for the erythrocyte sedimentation rate.There is also the very obvious repeated control of certain forms of sedimentation by climatic factors.Olivine and plagioclase continue to crystallize in the upper layer until critical concentrations are again reached and another pulse of sedimentation occurs.These criticisms include major ecological changes, reservoir sedimentation and the uprooting of large numbers of people.Simultaneously, sedimentation occurred at the base, as in previous experiments, so the mean concentration decreased with time.The sedimentation rate is elevated in 90-95 % of these patients and when above 50 Westergren helps confirm the diagnosis.
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