апсида

Etymology
Via some western language, ultimately from the oblique stem of.

Noun

 * 1)  apse semicircular recess covered with a vault or semi-dome
 * 2)  apsis point within an elliptical orbit with optimal distance to the focal body

Hyponyms

 * for heliocentric orbits: ,
 * for geocentric orbits: ,
 * for selenocentric orbits: ,

Noun

 * 1) apse

Etymology
.

Noun

 * 1) apse, apsis, exedra

Etymology
From.

Noun

 * 1) apse