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Search Result for "contrail": 
Wordnet 3.0

NOUN (1)

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;
[syn: contrail, condensation trail]


WordNet (r) 3.0 (2006):

contrail n 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 [syn: contrail, condensation trail]