This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A visible trail of streaks of condensed water vapor or ice crystals sometimes forming in the wake of an aircraft. Also called vapor trail.

n. An artificial cloud made by the exhaust of jet aircraft or wingtip vortices that precipitate a stream of tiny ice crystals in moist, frigid upper air.

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

"A bright dot, and then one -- you know, the term contrail doesn't really apply, because that's kind of streaking plasma, superheated ionized air."

cloud   

condensation trail    vapour trail   

fuzzball    greasiness    chromatogram    half-paralyzed    tensing    podgy    doinga    carburettor    oximetry    butthat