1. the science dealing with the occurrence, circulation, distribution, and properties of the waters of the earth and its atmosphere.
  2. hydrogeology; geohydrology.

Origin of hydrology

First recorded in 1755–65; hydro-1 + -logy
Related formshy·dro·log·ic [hahy-druh-loj-ik] /ˌhaɪ drəˈlɒdʒ ɪk/, hy·dro·log·i·cal, adjectivehy·dro·log·i·cal·ly, adverbhy·drol·o·gist, noun
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British Dictionary definitions for hydrologist


  1. the study of the distribution, conservation, use, etc, of the water of the earth and its atmosphere, particularly at the land surface
Derived Formshydrologic (ˌhaɪdrəˈlɒdʒɪk) or hydrological, adjectivehydrologically, adverbhydrologist, 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

Word Origin and History for hydrologist



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

Online Etymology Dictionary, © 2010 Douglas Harper

hydrologist in Science


  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.