‖n. [ NL., fr. Gr. &unr_; 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. ]