Apsis Definition

ăpsĭs
apsides
noun
apsides
An apse.
American Heritage
That point in the elliptical orbit of the moon, a planet, etc. nearest to (lower apsis), or that farthest from (higher apsis), the gravitational focus point.
Webster's New World
The point of greatest or least distance of the orbit of a celestial body from the center of mass of the system.
American Heritage
Webster's New World

(architecture) A recess or projection, with a dome or vault, at the east end of a church; an apse.

Wiktionary
Synonyms:
idiom
line of apsides
  • a line joining the lower and higher apsides, forming the major axis of the orbit
Webster's New World

Other Word Forms of Apsis

Noun

Singular:
apsis
Plural:
apsides

Idioms, Phrasal Verbs Related to Apsis

Origin of Apsis

  • Late Latin from Latin arch, vault from Greek hapsis from haptein to fasten

    From American Heritage Dictionary of the English Language, 5th Edition

  • Via Latin apsis, from Ancient Greek ἁψίς (hapsis, “arch, vault”). See also apse.

    From Wiktionary

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