Relating to or involving the casting of horoscopes or the interpretation of astrological birth charts.
Genethliac + -al suffix. This adjectival form emerged in medieval and Renaissance astrology texts to describe practices and beliefs centered on birth chart interpretation.
During the Renaissance, even Shakespeare knew this word—astrologers were called 'genethliacal practitioners,' making it the technical jargon of fortune-telling when it was still considered a serious science.
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