One of the mysteries of the English language finally explained.
The upper or outer curve of an arch.Often contrasted with intrados
- ‘The outer boundaries of a voussoir are the extrados.’
- ‘It is quite natural to obtain greater values at the intrados and smaller ones at the extrados since the inside fiber of the pipe is under compression while at the same time the outside fiber is under tension, during bending.’
Late 18th century: from French, from Latin extra ‘outside’ + French dos ‘back’ (from Latin dorsum).
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