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Apsis is a 5 letter word which starts with the letter A and ends with the letter S for which we found 3 definitions.

(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 coordinates any point for which the radius vector is a maximum or minimum.
(n.) Same as Apse.
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