a drain or channel crossing under a road, sidewalk, etc.; sewer; conduit.

1765–75; origin uncertain Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
culvert (ˈkʌlvət)
1.  a drain or covered channel that crosses under a road, railway, etc
2.  a channel for an electric cable
3.  a tunnel through which water is pumped into or out of a dry dock
[C18: of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1773, origin unknown, perhaps, as Weekley suggests, the name of a long-forgotten engineer or bridge-builder.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Huge culvert pipes and heavy concrete boxes had been laid on their sides nearby to serve as shelters, but they were not much used.
The work includes the removal and replacement of a flood damaged culvert.
The existing culvert is a bottomless structural plate arch mounted on concrete footings.
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