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Noun: vapor trail
Usage: US (elsewhere: vapour trail)
  1. An artificial cloud created by an aircraft; caused either by condensation due to the reduction in air pressure above the wing surface or by water vapor in the engine exhaust
    "The jet left a long vapor trail across the sky";
    - contrail, condensation trail, vapour trail [Brit, Cdn]

Derived forms: vapor trails

Type of: cloud

Encyclopedia: Vapor trail