Definition of gyttja in English:

gyttja

Syllabification: gyt·tja
Pronunciation: /ˈyiˌCHä
 
/

noun

Geology
Sediment rich in organic matter deposited at the bottom of a eutrophic lake.
More example sentences
  • The organic-rich bottom deposits (sapropels or gyttja) are rich in oil-producing organic compounds.
  • Incorporation of old carbon into basal gyttja yields ages from bulk samples that are initially about 600 yr too old.
  • All laboratory tests were performed on 19 samples of gyttja and lacustrine chalk taken from the lakelands.

Origin

late 19th century: Swedish, literally 'mud, ooze'.

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