dew point

noun
the temperature to which air must be cooled, at a given pressure and water-vapor content, for it to reach saturation; the temperature at which dew begins to form.
Also called dew-point temperature.


Origin:
1825–35

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Collins
World English Dictionary
dew point
 
n
the temperature at which water vapour in the air becomes saturated and water droplets begin to form

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
dew point  
The temperature at which the water vapor contained in a volume of air at a given atmospheric pressure reaches saturation and condenses to form dew. The dew point varies depending on how much water vapor the air contains, with humid air having a higher dew point than dry air. When large droplets of condensation form, they are deposited onto surfaces as dew. When smaller droplets form, they remain suspended in the air as mist or fog. If the dew point is below the freezing temperature of water (0°C), the water vapor turns directly into frost by sublimation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The temperature was near the dew point and steam was rising off its body.
Dew point temperature is a measure of atmospheric moisture.
The dew point is the temperature at which a vapor begins to condense at a
  constant pressure.
Dew point will be determined by one of the two procedures included in this test
  method.
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