English

Definition of vapour trail noun from the Oxford Advanced Learner's Dictionary

 

vapour trail

 noun
noun
BrE BrE//ˈveɪpə treɪl//
 
; NAmE NAmE//ˈveɪpər treɪl//
 
(especially US English vapor trail)
 
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the white line that is left in the sky by a plane