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Noun: vapour trail
Usage: Brit, Cdn (US: vapor 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 vapour in the engine exhaust
    "The jet left a long vapour trail across the sky";
    - contrail, condensation trail, vapor trail [US]

Derived forms: vapour trails

Type of: cloud

Encyclopedia: Vapour trail