from The American Heritage® Dictionary of the English Language, 4th Edition
- 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- 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
from the GNU version of the Collaborative International Dictionary of English
- 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.
from The Century Dictionary and Cyclopedia
- 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.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar
Late Latin, from Latin, arch, vault, from Greek hapsis, from haptein, to fasten.(American Heritage® Dictionary of the English Language, Fourth Edition)
Via Latin apsis, from Ancient Greek ἁψίς (hapsis, "arch, vault"). See also apse. (Wiktionary)