pylon

noun

1. 1.A gateway to the inner part of an Ancient Egyptian temple.
2. 2.A tower-like structure, usually one of a series, used to support high-voltage electricity cables.
3. 3.A structure used to mount engines, missiles etc., to the underside of an aircraft wing or fuselage.
4. 4.A starting derrick for an aeroplane.
5. 5.A post, tower, etc. as on an aerodrome, or flying ground, serving to bound or mark a prescribed course of flight.