noun

1. a gateway
2. a truncated pyramid, or two of these, serving as a gateway to an Egyptian temple
3. any slender, towering structure flanking an entranceway, supporting electric lines, marking a course for aircraft, etc.
4. an assembly attached to an airplane, usually under the wing, to hold an engine, fuel tank, weapon, etc.
5. ☆ Football any of the foam-rubber markers positioned upright at each corner of the end zone

Etymology: Gr pylōn, gateway, akin to pylē, gate