English dictionary
apsis
/'/&/ps/I/s/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
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a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar
Synonyms apseSource: WordNet 3.0
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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 <i>higher apsis</i>; the other, the <i>lower apsis</i>; and the line joining them, the <i>line of apsides</i>.
Source: webster1913