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clear air turbulence
avia., Canada	Turbulence encountered in air where no clouds are present. This expression is commonly applied to high- level turbulence associated with wind shear WS. CAT is often encountered in the vicinity of the jet stream.

clear: 23 phrases in 6 subjects

Biology	4
Entomology	8
Ichthyology	5
Mammals	1
Medical	4
Zoology	1