Prairies which have been turned into alternate mounds and hollows, sometimes symmetrically, by a succession of rains and droughts. See the account given of them by Prof. Riddell in Bartlett’s Dictionary.
1840. From difference of surface, soil, and exposure, there arises a great diversity in the size, depth, and general appearance of the hog-wallows.—American Journal of Science, xxxix. 212 (Oct.). (N.E.D.)
