A charlatan, quack, or fraudulent astrologer who falsely claims to predict the future or possess astrological knowledge.
From 'astrolog-' + '-aster' (a derogatory suffix meaning 'inferior or fake,' from Latin). This mocking term appeared in Renaissance and Early Modern English to critique false practitioners of astrology.
Adding '-aster' to something is basically the insult version of naming—like 'medicaster' for a fake doctor or 'poetaster' for a bad poet; people in the Renaissance were savage about calling out astrology fraudsters!
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