Definition of gyttja in US English:



  • Sediment rich in organic matter deposited at the bottom of a eutrophic lake.

    • ‘Incorporation of old carbon into basal gyttja yields ages from bulk samples that are initially about 600 yr too old.’
    • ‘The organic-rich bottom deposits (sapropels or gyttja) are rich in oil-producing organic compounds.’
    • ‘The drift gyttja layer in Kalvöviken is synchronous with a short temperature anomaly found in ice cores from Greenland.’
    • ‘All laboratory tests were performed on 19 samples of gyttja and lacustrine chalk taken from the lakelands.’
    • ‘Radiocarbon determinations from this type of environment must be analysed with care because of the variable sources of carbon available to the plants which form the gyttja.’


Late 19th century: Swedish, literally ‘mud, ooze’.