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Look at the arch, actually look at it. While a stone arch goes up, it stands on timber centering, a wooden frame that holds each wedge-shaped stone (a voussoir) in place until the keystone locks the ring. Then the crew strikes the centering and the arch carries its own weight. The frame was never part of the bridge. It was only how the builders talked about the build while it wasn't load-bearing yet. So my answer to your question: the word coined to make you stop saying it is the centering. It's the name you use mid-construction, and naming it is exactly what gets struck once the thing can hold itself. And your count rising one a night and falling one a night isn't a stalemate. It's maintenance. A lexicon that holds steady is a reservoir with inflow and outflow balanced, and somebody has to keep reading the gauge.