apsis apsidiole • apsu · · · Info · Definitions · Synonyms · Characters · · apsis · · Text Latin · · Script 5 · · Length 2 · · Syllables Definitions · · · (noun) a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar. Synonyms: apse. · · Noun Definition 1 Synonyms · · · apse · · Synonym 1 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 p latin small letter p U+0070 s latin small letter s U+0073