Hillock/ˈhɪlək/ Definition 1 of 1Pro Tip 1/3Natural Landscapes Hillock often describes natural, undisturbed land, not artificial mounds. Children played hide and seek, darting between trees on the hillock. Pro Tip 2/3Size Perspective Hillocks are larger than bumps but much smaller than mountains. A hillock rose gently from the plain, a perfect spot for our picnic. Pro Tip 3/3Not Urban Hillocks are usually found in rural settings, unlike skyscrapers in cities. From the top of the hillock, the rural village looked serene.