| Hummock 1. (n.) A rounded knoll or hillock; a rise of ground of no great extent, above a level surface. 2. (n.) A ridge or pile of ice on an ice field. 3. (n.) Timbered land. See Hammock. Thesaurus Entries anthill, barrow, brae, butte, down, drumlin, dune, fell, foothills, hill, hillock, knob, knoll, molehill, monticle, monticule, moor, mound, sand dune, swell |