any geological formation that absorbs and holds water but does not transmit it at a sufficient rate to supply springs, wells, etc.

aqui- + -clude < Latin clūdere, variant of claudere to close Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
aquiclude   (āk'wĭ-kld')  Pronunciation Key 
An impermeable body of rock or stratum of sediment that acts as a barrier to the flow of groundwater.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Permafrost acts as an aquiclude, restricting the movement and recharge of groundwater.
In a confined aquifer, the water is sandwiched between an upper and a lower layer of impermeable material called an aquiclude.
The sequence with depth contains dense clayey units that form an effective aquiclude.
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