Definition of pylon
1 a
:a usually massive gateway
b
:an ancient Egyptian gateway building in a truncated pyramidal form
c
:a monumental mass flanking an entranceway or an approach to a bridge
2 a
chiefly British
:a tower for supporting either end of usually a number of wires over a long span
b
:any of various towerlike structures
3 a
:a post or tower marking a prescribed course of flight for an airplane
b
:traffic cone
c
:one of the flexible upright markers positioned on a football field at the corners of the end zone
4
:a rigid structure on the outside of an aircraft for supporting something (such as an engine or missile) — see airplane illustration
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