apsisn.

英 'æpsɪs | 美 'æpsɪs

中文n. 教堂东端之半圆室；[天] 拱点

词根词源

apsis (n.)"perigree of the moon, perihelion of a planet" (plural apsides), 1650s, from Latin apsis "arch, vault" (see apse).

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apsis