GRE knoll Definition A small, rounded hill or mound. Example "They had a picnic on the sunny knoll overlooking the valley." Sign in to save GRE Quiz → ← knob knot → Study tips featuring "knoll" Write GRE Words Into Your Own Sentences Related words GRE swill GRE taper GRE testy GRE abacus SAT abase GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate SAT abdomen GRE abduct