[ 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.

Nearby words

  1. hydrokinetics,
  2. hydrolant,
  3. hydrolase,
  4. hydrologic,
  5. hydrologic cycle,
  6. hydrolysate,
  7. hydrolyse,
  8. hydrolysis,
  9. hydrolyst,
  10. hydrolyte

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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for hydrologic


/ (haɪˈdrɒlədʒɪ) /


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 hydrologic



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

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for hydrologic


[ hī-drŏlə-jē ]

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.