gap-toothed adjective2 •Exhibiting a gap between the teeth, especially between the two upper central incisors.Supreme Court Justice Sandra Day O'Connor, another gap-toothed woman, appears in a clip from her address to the Salvation Army. — 1997 •Exhibiting a gap where a tooth is missing, as of a child who has lost a baby tooth, or an adult who has lost a permanent tooth.Other slices of Canadian life included scenes of Niagara Falls, log-rolling, gap-toothed hockey players, and beer halls. — 2012