Culvert

n.

1.

A transverse drain or waterway of masonry under a road, railroad, canal, etc.; a small bridge.

Noun

1.

culvert - a transverse and totally enclosed drain under a road or railway

aqueduct, arroyo, bed, canal, creek bed, donga, dry bed, flume, gulch, gully, gullyhole, headrace, irrigation ditch, nullah, race, river bed, riverway, runnel, sluice, spillbox, spillway, stream bed, streamway, swash, swash channel, tailrace, wadi, water carrier, water channel, water furrow, water gap, water gate, watercourse, waterway, waterworks