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A masonry airch
1. cunyie 2. Voussoir 3. Extrados 4. dowpstane 5. Intrados 6. Rise 7. Clear span 8. Abutment

An airch is a structur that spans a space an supports structur an wecht abuin it. Airches appeared as early as the 2nt millennium BC in Mesopotamie brick airchitectur [1] an thair seestematic uise stairtit wi the Auncient Romans that wis the first tae applee the technique tae a wide reenge o structurs.


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  1. "Ancient Mesopotamia:Architecture". The Oriental Institute of the University of Chicago. Archived frae the original on 16 Mey 2012. Retrieved 16 Mey 2012.