dry well

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dry well

also dry·well (drī′wĕl′)
n.
An underground chamber, usually containing stones or rubble, that collects rainwater from the roof of a building and allows it to seep gradually into the soil, reducing runoff.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

dry′ well`


n.
a hole used to drain off surface water, allowing it to be absorbed underground.
[1760–70]
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