hydrology

[hahy-drol-uh-jee]
noun
1.
the science dealing with the occurrence, circulation, distribution, and properties of the waters of the earth and its atmosphere.
2.
hydrogeology; geohydrology.

Origin:
1755–65; hydro-1 + -logy

hydrologic [hahy-druh-loj-ik] , hydrological, adjective
hydrologically, adverb
hydrologist, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hydrology (haɪˈdrɒlədʒɪ)
 
n
the study of the distribution, conservation, use, etc, of the water of the earth and its atmosphere, particularly at the land surface
 
hydrologic
 
adj
 
hydro'logical
 
adj
 
hydro'logically
 
adv
 
hy'drologist
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
hydrology   (hī-drŏl'ə-jē)  Pronunciation Key 
The scientific study of the properties, distribution, and effects of water as a liquid, solid, or gas on the Earth's surface, in the soil and underlying rocks, and in the atmosphere.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Forests provide myriad other benefits, especially in hydrology and by hosting
  millions of species.
Appointment to them now requires some knowledge of engineering and hydrology,
  not simply a friend in politics.
The logical solution would be to update the formula, to take account of half a
  century's worth of hydrology.
Many types of plants exist in permafrost regions, depending on the climate and
  hydrology.
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