noun
a visible trail left in the sky by an aircraft and consisting of a line of condensed water or ice particles created by the aircraft's engines
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The contrail left by the airplane lingered in the sky for several minutes.
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Did you see that long white line in the sky? That's a contrail from a passing plane.
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Check out that sky streak! It's a contrail from a jet flying overhead.
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His words left a contrail of doubt in her mind, lingering long after he had spoken.