1. [n]  a large vertical steel tower supporting high-tension wires
2. [n]  a tower for guiding pilots or marking the turning point in a race

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Pylon
PYLON, one of Faulkner`s minor novels, is set in New Orleans during Mardi Gras, and centers on a group of airmen who are in town for the festivities. It was published in 1935.

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1. \Py"lon\, n.
   1. A tower, commonly of steelwork, for supporting either end
      of a wire, as for a telegraph line, over a long span.
   2. (A["e]ronautics)
      (a) Formerly, a starting derrick (the use of which is now
          abandoned) for an a["e]roplane.
      (b) A post, tower, or the like, as on an a["e]rodrome, or
          flying ground, serving to bound or mark a prescribed
          course of flight.
   

2. \Py"lon\, n. [NL., fr. Gr. ? a gateway.]
   (a) A low tower, having a truncated pyramidal form, and
       flanking an ancient Egyptian gateway.
             Massive pylons adorned with obelisks in front. --J.
                                                  W. Draper.
   (b) An Egyptian gateway to a large building (with or without
       flanking towers).