bog-earthn. earth composed of, or largely mixed with, peat.
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the world > the earth > structure of the earth > constituent materials > earth or soil > kind of earth or soil > [noun] > organic soil > peat or peaty soil
peat1400
turbaryc1450
turf1510
moor1596
moor earth1607
bog-earth1787
yarpha1805
pegasse1825
bog-mould1834
1787–8 Bot. Mag.2 46 Soil, a mixture of loam and bog earth.