The compound adjective "three-hole" is a transparent modern English formation. Its first element, "three," descends from the ancient Proto-Indo-European numeral tréyes, which has remained remarkably stable in meaning through its Germanic lineage into Old and Modern English. The second element, "hole," originates from a Proto-Indo-European root meaning to cover or hide, evolving in Germanic to denote a hollow or an aperture. The compound logically combines these two concrete concepts to specify an object possessing three such openings, most commonly used in contexts like paper binding (three-hole punch) or certain industrial fasteners.

Structure: three (number) + hole (opening) - three: From Old English þrīe, þrēo, from Proto-Germanic þrīz, from Proto-Indo-European tréyes. Functions as a cardinal number. - hole: From Old English hol (a hollow place, cave), from Proto-Germanic hulą, from Proto-Indo-European kel- (to cover, conceal). Functions as a noun denoting an opening or hollow space.