GNU Collaborative International Dictionary of English

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Found one definition

1.       
   ‖Pylon (?), n. [NL., fr. Gr.  a gateway.] (a) A low tower, having a truncated pyramidal form, and flanking an ancient Egyptian gateway.
   
   [1913 Webster]
   
   Massive pylons adorned with obelisks in front. J. W. Draper.
   
   [1913 Webster]
   
   (b) An Egyptian gateway to a large building (with or without flanking towers).
   
   [1913 Webster]
   
   
   2. A tower, commonly of steelwork, for supporting either end of a wire, as for a telegraph line, over a long span.
   
   [Webster 1913 Suppl.]
   
   
   3.  (Aeronautics) (a) Formerly, a starting derrick (the use of which is now abandoned) for an aeroplane. (b) A post, tower, or the like, as on an aerodrome, or flying ground, serving to bound or mark a prescribed course of flight.
   
   [Webster 1913 Suppl.]