Relating to Galen, the ancient Greek physician; following medical theories and practices based on Galen's teachings.
From 'Galen' (Greek physician, 129-200 CE) plus '-ian' meaning 'relating to.' Galen's medical theories dominated European medicine for over 1,500 years, so the adjective became deeply embedded in medical terminology.
Galen's theories were so powerful that doctors followed his teachings for 1,500 years without serious challenge—talk about a long-lasting legacy, even though he was often wrong!
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