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arch
noun
A curved structural element, typically semicircular, that spans an opening and supports weight above it by transferring downward force outward to supports on either side. Also refers to any curved shape resembling this architectural form.
Etymology
Origin: Latin
Root: arcus (a bow, arc, arch) — "ruler"
Example
"The ancient Roman arch has stood for centuries, its curved stones distributing the bridge's weight perfectly to the pillars below."
Usage Notes
Arch functions in both architectural and general contexts. In architecture, it's precise technical term for load-bearing curved structures. In general use, describes any inverted U-shape ('arched eyebrows,' 'cat arched its back'). Register is neutral, suitable for technical and everyday contexts. Common confusion: don't conflate with 'arc' (portion of curved line) though they share etymology.