The American Heritage® Dictionary of the English Language, 4th Edition
n. 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.
n. The science of the properties, distribution, and effects of water on a planet's surface, in the soil and underlying rocks, and in the atmosphere
the GNU version of the Collaborative International Dictionary of English
n. The science of water, its properties, phenomena, and distribution over the earth's surface.
The Century Dictionary and Cyclopedia
n. The science of water, its properties, phenomena, and laws, its distribution over the earth's surface, etc.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the branch of geology that studies water on the earth and in the atmosphere: its distribution and uses and conservation
Word Usage
"So instead of being buried in concrete, excised from the daily life of the city and only experienced by municipal workers, urban hydrology is visibly, even prominently, incorporated into the surface fabric of the city."