Definition of gyttja in English:

gyttja

noun

Geology
  • [mass noun] 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.’
    • ‘All laboratory tests were performed on 19 samples of gyttja and lacustrine chalk taken from the lakelands.’
    • ‘The drift gyttja layer in Kalvöviken is synchronous with a short temperature anomaly found in ice cores from Greenland.’
    • ‘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.’
    • ‘The organic-rich bottom deposits (sapropels or gyttja) are rich in oil-producing organic compounds.’

Origin

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

Pronunciation:

gyttja

/ˈjɪtʃə/