Hummock/ˈhʌmək/ Definition 1 of 2Pro Tip 1/3Natural Landscapes Often found in clusters, hummocks create uneven, rolling landscapes. The field beyond the village was dotted with grassy hummocks. Pro Tip 2/3Small in Size A hummock is smaller than a hill; think of it as a mini-hill. The children played king of the hill on the grassy hummock. Pro Tip 3/3Not Man-Made Unlike a mound, hummocks are usually formed by natural processes. Rabbits burrowed in the hummocks scattered across the meadow.