GRE gnat Definition A small flying insect that resembles a tiny mosquito. Example "A cloud of gnats hovered over the pond at dusk." Sign in to save GRE PDF — $25 ← gnarled gnaw → 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