a large semicircular or polygonal recess in a church, arched or with a domed roof and typically at the church's eastern end 教堂凹殿(多建于教堂东侧的半圆形或多边形凹形结构,有圆顶或拱顶)
another term for apsis 同 apsis
派生 apsidal [ˈapsɪd(ə)l] adjective 语源
early 19th cent. (in sense 2): from Latin apsis (see apsis)