That upper stratum of earth and vegetable mold which is filled with the roots of grass and other small plants, so as to adhere and form a kind of mat; sward; sod.

To cover with turf or sod; as, to turf a bank, or the border of a terrace.

A sod. The upper portion of soil filled with the roots and stems of low-growing, living plants.

Surface earth filled with the matted roots of grass and other plants, cut out for use in facing a bank.