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Apsis   Listen
noun
Apsis  n.  (pl. apsides)  (See Apse)
1.
(Astron.) 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.) In a curve referred to polar coördinates, any point for which the radius vector is a maximum or minimum.
3.
(Arch.) Same as Apse.






Collaborative International Dictionary of English 0.48








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Words linked to "Apsis" :   church, niche, church building, recess, apse, tribune



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