Plural of genethliac; people practiced in casting birth horoscopes or multiple birth-related astrological charts.
Genethliac (Greek origin) + -s plural marker. As astrology became more systematized, practitioners formed a professional class referred to collectively as genethliacs.
Medieval cities had entire guilds of competing genethliacs trying to prove their charts were more accurate—professional astrologers who staked their reputations on reading the stars at birth.
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