noun an egyptian gateway to a large building (with or without flanking towers).
2. pylon ·noun a low tower, having a truncated pyramidal form, and flanking an ancient egyptian gateway.
3. pylon ·add. ·noun formerly, a starting derrick (the use of which is now abandoned) for an aeroplane.
4. pylon ·add. ·noun a tower, commonly of steelwork, for supporting either end of a wire, as for a telegraph line, over a long span.
5. pylon ·add. ·noun a post, tower, or the like, as on an aerodrome, or flying ground, serving to bound or mark a prescribed course of flight.