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Definitions for Apsis

[1] Astronomy . either of two points in an eccentric orbit, one (higher apsis) farthest from the center of attraction, the other (lower apsis) nearest to the center of attraction.
[2] Architecture . an apse.
[3] 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
[4] another name for apse (def. 1)

Words nearby Apsis

après-ski, apsaras, apse, apsidal motion, apsidiole, apsis, apsu, apsyrtus, apt, apt., apteral

Origin of Apsis

1595–1605; < Latin < Greek hapsís (felloe of) a wheel, arch, vault, orig., fastening, equivalent to háp(tein ) to fasten + -sis -sis

Word origin for Apsis

C17: via Latin from Greek; see apse