APSIDES
APSIS
apse, apsis
(noun) a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar
Source: WordNet® 3.1
Noun
apsides
plural of apside
plural of apsis
Anagrams
• aspides, dispase
Source: Wiktionary
Ap"si*des, n. pl.
Definition: See Apsis.
APSIS
Ap"sis, n.; pl. Apsides. See Apse. Etym: [L. apsis, absis, Gr.
1. (Astron.)
Definition: 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.
2. (Math.)
Definition: In a curve referred to polar coördinates, any point for which
the radius vector is a maximum or minimum.
3. (Arch.)
Definition: Same as Apse.
Source: Webster’s Unabridged Dictionary 1913 Edition