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[hahy-drol-uh-jee] /haɪˈdrɒl ə dʒi/
the science dealing with the occurrence, circulation, distribution, and properties of the waters of the earth and its atmosphere.
hydrogeology; geohydrology.
Origin of hydrology
1755-65; hydro-1 + -logy
Related forms
[hahy-druh-loj-ik] /ˌhaɪ drəˈlɒdʒ ɪk/ (Show IPA),
hydrological, adjective
hydrologically, adverb
hydrologist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for hydrologic
  • hydrologic changes that increase this flow can cause the stream channel to become unstable.
  • The regional nature of hydrologic processes is generally defined in terms of shared meteorological and basin characteristics.
  • The water cycle is also known as the hydrologic cycle.
  • Once out of storage it reenters the active hydrologic cycle.
  • In particular, the different effects on the surface and the atmosphere mean that the hydrologic cycle would be changed.
  • The fact is basins are montane generated and flows are here longer than us, but shorter in event, both magmatic and hydrologic.
British Dictionary definitions for hydrologic


the study of the distribution, conservation, use, etc, of the water of the earth and its atmosphere, particularly at the land surface
Derived Forms
hydrologic (ˌhaɪdrəˈlɒdʒɪk), hydrological, adjective
hydrologically, adverb
hydrologist, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for hydrologic



1762, from hydro- + -logy. Related: Hydrologist; hydrological (1660s).

Online Etymology Dictionary, © 2010 Douglas Harper
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hydrologic in Science
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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