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inverted arch

noun
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Definition of inverted arch

: an arch with the crown downward that is much used in foundations, sewers, and tunnels and is often made of solid concrete

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“Inverted arch.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/inverted%20arch. Accessed 10 December 2019.

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