n. A low elevation, hillock, or knoll.n. The form of the hand when the fingers are joined and bent in an even line, or bunched with the end of the thumb: as, to mak' a hummock.n. As much of any loose material as can be taken up in the hand with the fingers so bent: as, a hummock of meal.n. A low hill of sand on the sea-shore. Compare dune.