py·lon

[pahy-lon]
noun
1.
a marking post or tower for guiding aviators, frequently used in races.
2.
a relatively tall structure at the side of a gate, bridge, or avenue, marking an entrance or approach.
3.
a 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.
4.
a steel tower or mast carrying high-tension lines, telephone wires, or other cables and lines.
5.
Aeronautics. a finlike device used to attach engines, auxiliary fuel tanks, bombs, etc., to an aircraft wing or fuselage.

Origin:
1840–50; < Greek pylṓn gateway, gate tower

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Pylon is always a great word to know.
So is simple pendulum. Does it mean:
apparatus with suspended point mass, frictionless thread, constant length and periodic motion
coefficient of substance's elasticity expressing ratio between pressure and fractional change
Collins
World English Dictionary
pylon (ˈpaɪlən) [Click for IPA pronunciation guide]
 
n
1.  a large vertical steel tower-like structure supporting high-tension electrical cables
2.  a post or tower for guiding pilots or marking a turning point in a race
3.  a streamlined aircraft structure for attaching an engine pod, external fuel tank, etc, to the main body of the aircraft
4.  a monumental gateway, such as one at the entrance to an ancient Egyptian temple
5.  a temporary artificial leg
 
[C19: from Greek pulōn a gateway]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

pylon
1823, "gateway to an Egyptian temple," from Gk. pylon "gateway," from pyle "gate," of unknown origin. Meaning "tower for guiding aviators" (1909) led to that of "steel tower for high-tension wires" (1923).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The pier table, the first segment of the deck at the pylon is built on
  falsework or supported from the pier.
In season, you can watch the local ospreys nesting atop a pylon through a
  webcam.
Simply make it a legal requirement to put a wind turbine on every new
  electricity pylon, for instance.
The pylon is mounted on a concrete foundation that can support the weight and
  wind loading on the collector.
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