D defs.my
Entry 4 senses Webster, 1913

Pylon

/pīl'-änˌ/ · Py·lon · IPA /ˈpaɪ.lən/
01 n. A low tower, having a truncated pyramidal form, and flanking an ancient Egyptian gateway.
  1. 1.
    A low tower, having a truncated pyramidal form, and flanking an ancient Egyptian gateway.
    “Massive pylons adorned with obelisks in front.” — J. W. Draper.
  2. 2.
    An Egyptian gateway to a large building (with or without flanking towers).
  3. 3.
    A tower, commonly of steelwork, for supporting either end of a wire, as for a telegraph line, over a long span.
  4. 4.
    Formerly, a starting derrick (the use of which is now abandoned) for an aeroplane.(Aeronautics)