pylon

py•lon n. [countable]

Aeronauticsa marking post or tower for guiding an aircraft pilot.
a relatively tall structure at the side of a gate, bridge, or avenue.
Civil Engineeringa steel tower used as a support, as for supporting electrical wires.

py•lon n.

Aeronauticsa marking post or tower for guiding aviators, frequently used in races.
a relatively tall structure at the side of a gate, bridge, or avenue, marking an entrance or approach.
Architecturea monumental tower forming the entrance to an ancient Egyptian temple, consisting either of a pair of tall quadrilateral masonry masses with sloping sides and a doorway between them or of one such mass pierced with a doorway.
Civil Engineeringa steel tower or mast carrying high-tension lines, telephone wires, or other cables and lines.
Aeronauticsa finlike device used to attach engines, auxiliary fuel tanks, bombs, etc., to an aircraft wing or fuselage.

Collins Concise English Dictionary © HarperCollins Publishers::

pylon /ˈpaɪlən/ n

a large vertical steel tower-like structure supporting high-tension electrical cables
a post or tower for guiding pilots or marking a turning point in a race
a streamlined aircraft structure for attaching an engine pod, external fuel tank, etc, to the main body of the aircraft
a monumental gateway, such as one at the entrance to an ancient Egyptian temple

Etymology: 19th Century: from Greek pulōn a gateway

'pylon' also found in these entries (note: many are not synonyms or translations):

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