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humidity

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hu⋅mid⋅i⋅ty

[hyoo-mid-i-tee or, often, yoo-]
–noun
1. humid condition; moistness; dampness.
2. relative humidity.
3. an uncomfortably high amount of relative humidity: It's not the heat, it's the humidity that tires me out.

Origin:
1350–1400; ME humydite < L (h)ūmiditās. See humid, -ity

relative humidity

–noun
the amount of water vapor in the air, expressed as a percentage of the maximum amount that the air could hold at the given temperature; the ratio of the actual water vapor pressure to the saturation vapor pressure. Abbreviation: RH, rh
Also called humidity.


Origin:
1810–20
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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hu·mid·i·ty   (hyōō-mĭd'ĭ-tē)   
n.  
  1. Dampness, especially of the air.

  2. Relative humidity.


[Middle English humidite, from Old French, from Medieval Latin hūmiditās, from Latin hūmidus, humid; see humid.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: hu·mid·i·ty
Pronunciation: hyü-'mid-&t-E, yü-
Function: noun
Inflected Form: plural -ties
: a moderate degree of wetness especially of the atmosphere —see ABSOLUTE HUMIDITY, RELATIVE HUMIDITY

Main Entry: relative humidity
Function: noun
: the ratio of the amount of water vapor actually present in the air to the greatest amount possible at the same temperature—compare ABSOLUTE HUMIDITY
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

humidity hu·mid·i·ty (hy&oomacr;-mĭd'ĭ-tē)
n.
Dampness, especially of the air.

relative humidity n.
The ratio of the amount of water vapor in the air at a specific temperature to the maximum amount that the air could hold at that temperature, expressed as a percentage.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
humidity   (hy-mĭd'ĭ-tē)  Pronunciation Key 
The amount of water vapor in the atmosphere, usually expressed as either absolute humidity or relative humidity.
relative humidity  
The ratio of the actual amount of water vapor present in a volume of air at a given temperature to the maximum amount that the air could hold at that temperature, expressed as a percentage. Warm air can hold more water vapor than cool air, so a particular amount of water vapor will yield a lower relative humidity in warm air than it does in cool air. Compare absolute humidity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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