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apronless | apropos | apse | apsidal | apsides | apsis | apsu | apt | apt to | aptable | aptate

apsis

 : 
Noun
 : 
ap=sis

CIDE DICTIONARY

apsisn. [L. apsis, absis, Gr. "apsi`s, "apsi^dos, a tying, fastening, the hoop of a wheel, the wheel, a bow, arch, vault, fr. "a`ptein to fasten.].
  •  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.  [1913 Webster]
  •  In a curve referred to polar coördinates, any point for which the radius vector is a maximum or minimum.  [1913 Webster]
  •  Same as Apse.  [1913 Webster]

OXFORD DICTIONARY

apsis, n. (pl. apsides) either of two points on the orbit of a planet or satellite that are nearest to or furthest from the body round which it moves.

Derivative
apsidal adj.
Etymology
L f. Gk (h)apsis, -idos arch, vault

For further exploring for "apsis" in Webster Dictionary Online


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