underdeck

The part of a bridge that lies beneath the deck, or surface.

Noun

  1. The part of a bridge that lies beneath the deck, or surface.
    • During my nearly 20 years as an engineer with the New York City Department of Transportation, I witnessed numerous bridge failures, including the collapse of the West Side Highway in 1973, the fatal snap of a Brooklyn...

Origin

From under- + deck.

Forms

underdecks