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hy·drol·o·gy (hī-drŏĺə-jē)

noun 

The scientific study of the properties, distribution, and effects of water on the earth's surface, in the soil and underlying rocks, and in the atmosphere.

derivatives

hýdro·loǵic
adjective
hýdro·loǵi·cal·ly
adverb
hy·droĺo·gist
noun