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hydromedusa
hydromel
hydrometallurgy
hydrometeor
hydrometer
hydromorphic
hydropathy
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hydrology
hy·drol·o·gy [ hī drólləjee ]


noun 
Definition:
 
study of earth's water: the scientific study of the properties, distribution, use, and circulation of the water on Earth and in the atmosphere in all of its forms

hy·drol·o·gist noun
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