Extrados

[eks'treidɔs]

解释:

(noun.) the exterior curve of an arch.

编辑:韦斯利--From WordNet

解释:

(n.) The exterior curve of an arch; esp., the upper curved face of the whole body of voussoirs. See Intrados.

整理:纳特

解释:

n. the convex surface of an arch or vault.

校对:凯特