apsis

英 ['æpsɪs] 美 ['æpsɪs]
  • n. 教堂东端之半圆室；[天] 拱点
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英文词源

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