American Heritage Dictionary
(1)
Century Dictionary
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
The bridge's dynamic shape is inspired from the metaphor of the contrail, a stream of crystallized vapor created in a plane's wake.— Skycontrol
The altitudes of the points of the terrain at which the contrail is projected onto is important in reconstructing the actual trajectory and any error in that terrain height directly produces errors in the reconstruction.— ArmsControlWonk
If i look up and see a curved contrail, a few minutes later will see the E3 (and a quick tune of the radio usually brings in the target vectoring channel!)— Army Rumour Service

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a year.
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