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n. Architecture An apse.

n. Astronomy The point of greatest or least distance of the orbit of a celestial body from a center of attraction.

n. A recess or projection, with a dome or vault, at the east end of a church; an apse.

n. 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

n. One of the two points of an orbit, as of a planet or satellite, which are at the greatest and least distance from the central body, corresponding to the aphelion and perihelion of a planet, or to the apogee and perigee of the moon. The more distant is called the higher apsis; the other, the lower apsis; and the line joining them, the line of apsides.

n. In a curve referred to polar coördinates, any point for which the radius vector is a maximum or minimum.

n. Same as Apse.

n. In astronomy, a point in the eccentric orbit of a planet in which it is either furthest from or nearest to the body about which it revolves.

n. In architecture, same as apse.

n. A reliquary or case in which the relies of saints are kept, especially one of a form imitating the curves of a dome or vault.

n. Sometimes written absis.

n. a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar

"In the apsis was a mosaic which represented the Blessed Trinity, and of which in 1512 some remnants were still found."

apsides    apse   

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