Curved into an arch shape; bent in a curved form like a bow.
From Middle English 'arched,' past participle of 'arch,' derived from Old French and ultimately from Latin 'arcus' meaning 'bow.' The shape of a drawn bow inspired the term for curved structures.
The arch is one of architecture's greatest discoveries—'arched' roofs changed human building forever because they distribute weight so efficiently. Medieval cathedrals would never have reached the sky without the perfect curve!
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