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n. pl. ap·si·des (-sĭ-dēz′)
1. Architecture An apse.
2. Astronomy The point of greatest or least distance of the orbit of a celestial body from the center of mass of the system.

[Late Latin, from Latin, arch, vault, from Greek hapsis, from haptein, to fasten.]


n, pl apsides (æpˈsaɪdiːz; ˈæpsɪˌdiːz)
1. (Astronomy) Also called: apse either of two points lying at the extremities of an eccentric orbit of a planet, satellite, etc, such as the aphelion and perihelion of a planet or the apogee and perigee of the moon. The line of apsides connects two such points and is the principal axis of the orbit
2. (Architecture) another name for apse1
[C17: via Latin from Greek; see apse]
apsidal adj


(ˈæp sɪs)

n., pl. -si•des (-sɪˌdiz)
1. either of the two points farthest or nearest the center of attraction in an eccentric astronomical orbit.
[1595–1605; < Latin < Greek hapsís (felloe of) a wheel, arch, vault, orig., fastening, derivative (of háptein to fasten]


- The extreme point of an orbit.
See also related terms for orbit.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.apsis - a domed or vaulted recess or projection on a building especially the east end of a churchapsis - a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar
church building, church - a place for public (especially Christian) worship; "the church was empty"
niche, recess - an enclosure that is set back or indented
tribune - the apse of a Christian church that contains the bishop's throne
References in periodicals archive ?
Popularnosc preparatow z chromem, ktorej apogeum zanotowano pod koniec XX w., przyniosla duza liczbe badan dotyczacych wplywu suplementacji tym pierwiastkiem na gospodarke weglowodanowo-lipidowa organizmu, w tym skutecznosc w przebiegu roznego typu nietolerancji glukozy, sklad ciala, a zwlaszcza beztluszczowa mase ciala i zdolnosc wysilkowa sportowcow.
Smykal, Josef: Jan Drtina, Apogeum http://www.apogeum.info/tlex/heslo.php?id=231 [accessed 24 October 2015].
Zowel in Zuid-Afrika, alsook in Polen werd de maand juni 1976 tot een kritische apogeum van het politieke verzet.