'astrologer' originates from Medieval Latin, specifically the word 'astrologus', where Greek 'astron' meant 'star' and 'logos' meant 'study' or 'discourse'.

'astrologer' changed from Old French/Middle English forms (e.g. Old French 'astrologier' / Middle English 'astrologer') and eventually became the modern English word 'astrologer'.

Initially, it meant 'one who studies the stars' (often in a scholarly or philosophical sense), but over time it evolved into its current common meaning of 'someone who interprets celestial positions to predict or explain human affairs'.