Word: apsis
Phonetic:
/ˈæpsɪs/
Listen:
A recess or projection, with a dome or vault, at the east end of a church; an apse.
Either of the points in the elliptical orbit of a planet or comet where it is closest or furthest from the sun; perihelion or aphelion; an apside
You can find a list of possible crossword clues for APSIS below.