periapsis periappendicular • periapt · · · Info · Definitions · Synonyms · Antonyms · Characters · · periapsis · · Text Latin · · Script 9 · · Length 4 · · Syllables Definitions · · · (noun) (astronomy) the point in an orbit closest to the body being orbited. Synonyms: point of periapsis. · · Noun Definition 1 Synonyms · · · point of periapsis · · Synonym 1 Antonyms · · · apoapsis · · Antonym 0 point of apoapsis · · Antonym 1 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 i latin small letter i U+0069 p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073