We don't have synonyms for antiscion yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are antiscian, antiscii and antinion.
(n) :
(astrology) The mirror image, or shadow, of a planet, based upon a line of reference which is the axis of 0 Cancer/0 Capricorn (the position of the sun at the solstices).
(n) :
(astrology) The mirror image, or shadow, of a planet, based upon a line of reference which is the axis of 0 Cancer/0 Capricorn (the position of the sun at the solstices).