a ditch or moat Avebury had at one time within a great rampart and a _______, which is still forty feet deep, a large circle of rough unhewn stones, and within this two circles each containing a smaller concentric circle.

a low tract of land, especially when moist or marshy; shallow troughlike depression that carries water mainly during rainstorms or snow melts I went to the top of a hill and saw the colt at the far side of the pasture in what we call the _____ -- low, wet ground, where weeds abound.

land covered with grassy turf; a lawn or meadow The moonlight on the lawn was tremulous, as if the _______ were a rippling sea.

an unforested rolling plain; a moor; a grassland The house stood out in the open, a broad _______, devoid of trees, the sparse vegetation stubbled with smooth rocks.