Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of apsis is as below...

Apsis :: Apsis (n.) Same as Apse.

Regrede :: Regrede (v. i.) To go back; to retrograde, as the apsis of a planet's orbit..

Apsides :: Apsides (n. pl.) See Apsis.

Absis :: Absis (n.) See Apsis.

Apsis :: Apsis (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..

Apsis :: Apsis (n.) In a curve referred to polar coordinates, any point for which the radius vector is a maximum or minimum..

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