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sinkhole

[singk-hohl] /ˈsɪŋkˌhoʊl/
noun
1.
a hole formed in soluble rock by the action of water, serving to conduct surface water to an underground passage.
2.
Also called sink. a depressed area in which waste or drainage collects.
Origin
late Middle English
1425-1475
1425-75; late Middle English; see sink, hole
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sink holes

sinkhole

/ˈsɪŋkˌhəʊl/
noun
1.
Also called (esp Brit) swallow hole. a depression in the ground surface, esp in limestone, where a surface stream disappears underground
2.
a place into which foul matter runs
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for sink holes

sinkhole

n.

also sink-hole, mid-15c., "sewage pit," from sink (n.) + hole (n.). As a geological phenomenon, "hole made in the earth in limestone regions by underground erosion," 1780, from sink (v.).

Online Etymology Dictionary, © 2010 Douglas Harper
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sink holes in Science
sinkhole
  (sĭngk'hōl')   
A natural depression in a land surface formed by the dissolution and collapse of a cavern roof. Sinkholes are roughly funnel-shaped and on the order of tens of meters in size. They generally occur in limestone regions and are connected to subteranean passages. Also called sink. See more at karst topography.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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8
9
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