Etymology
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contrail (n.)

"white line of ice crystals behind an airplane in motion," 1945, from condensation trail (1942); see condensation.

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Definitions of contrail

contrail (n.)
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;
Synonyms: condensation trail
From wordnet.princeton.edu