Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Language: Old French
Origin: arche, from Latin arcus; ARC

arch

1 noun
     
arch
arch1 S3 [countable]
1AA a structure with a curved top and straight sides that supports the weight of a bridge or building
2AA a curved structure above a door, window etc
3HBH a curved structure of bones in the middle of your foot
4CF something with a curved top and straight sides

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