peat /piːt/ BrE AmE noun
[ Date: 1300-1400 ; Language: Medieval Latin ; Origin: peta , probably from a Celtic language ]
[uncountable] a black substance formed from decaying plants under the surface of the ground in some areas, which can be burned as a ↑ fuel , or mixed with soil to help plants grow well
—peaty adjective :
a rich, peaty soil