adjective Geology.
found or located above the water table: vadose water; vadose zone.

1895–1900; < Latin vadōsus shallow, equivalent to vad(um) a shoal, ford + -ōsus -ose1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vadose (ˈveɪdəʊs)
of, relating to, designating, or derived from water occurring above the water table: vadose water; vadose deposits
[C19: from Latin vadōsus full of shallows, from vadum a ford]

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Example sentences
The vadose zone is critical because it is the only armor the water table has to protect it from contaminants on the surface.
Although fission molybdenum isotopes have been identified in vadose zone samples, in the groundwater natural molybdenum dominates.
Residence time in the vadose zone is controlled by the infiltration rate, vadose zone sediment thickness, and sorption.
Therefore, adequate evaluation of future ground water contamination risk will often require sampling vadose zone soils.
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