pylon

Etymology

From Ancient Greek πυλών (pulṓn, “gateway”).

noun

1. A gateway to the inner part of an Ancient Egyptian temple.
2. (electricity) A tower-like structure, usually one of a series, used to support high-voltage electricity cables.
   The highway to the East Coast which ran through the borough of Ebbfield had always been a main road and even now, despite the vast garages, the pylons and the gaily painted factory glasshouses which had sprung up beside it, there still remained an occasional trace of past cultures. 1963, Margery Allingham, chapter 7, in The China Governess
3. (architecture) A tall steel or concrete tower from which cables are strung.
4. A lighting mast; a freestanding support for floodlights.
5. (aviation) A structure used to mount engines, missiles etc., to the underside of an aircraft wing or fuselage.
6. (aviation, historical) A starting derrick for an aeroplane.
7. (aviation, historical) A post, tower, etc. as on an aerodrome, or flying ground, serving to bound or mark a prescribed course of flight.
8. An obelisk.
   The Washington Monument is often described as an obelisk, and sometimes even as a “true obelisk,” even though it is not. A true obelisk is a monolith, a pylon formed out of a single piece of stone. 2012-01, Henry Petroski, “The Washington Monument”, in American Scientist, volume 100, number 1, page 16
9. A traffic cone.
10. (American football) An orange marker designating one of the four corners of the end zone in American football.
11. (medicine) A rigid prosthesis for the lower leg.
    McKenzie uses a pylon for all above knee amputees, and orders a permanent leg when function merits it. 1963, Robert Mazet, The Influence of Prosthesis Wearing on the Health of the Geriatric Patient, page 5
    During the early postoperative period, before the patient has a prosthesis, they may have a rigid dressing with a pylon. 2007, Michelle H. Cameron, Linda Monroe, Physical Rehabilitation - E-Book