apsis (plural apsides)
- (architecture) A recess or projection, with a dome or vault, at the east end of a church; an apse.
- (astronomy) 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
astronomy: point in elliptical orbit
- (rare) An apse (architectural element).
Declension of apsis (type vastaus)