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 PDF — $25 ← knob knot → Related words GRE awe GRE smithereens GRE abacus SAT abase GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate SAT abdomen GRE abduct GRE aberrant