Etymology
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culvert (n.)

"a drain of brickwork or masonry under a road, railroad, etc.," 1773, origin unknown; OED calls it "A recent word of obscure origin." Perhaps, as Weekley suggested long ago, it is the name of a long-forgotten engineer or bridge-builder.

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Definitions of culvert

culvert (n.)
a transverse and totally enclosed drain under a road or railway;
From wordnet.princeton.edu