Etymology
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hydrology (n.)

"the science of water," 1762, from hydro- + -logy. Related: Hydrologist; hydrological (1660s).

updated on September 18, 2015

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Definitions of hydrology from WordNet

hydrology (n.)
the branch of geology that studies water on the earth and in the atmosphere: its distribution and uses and conservation;
From wordnet.princeton.edu, not affiliated with etymonline.