Magical or medicinal drinks or liquids, typically with special or supernatural properties.
From Latin 'potio' meaning 'a drink', derived from 'potare' (to drink). The word entered English through Old French and became associated with magical or medicinal concoctions.
In Harry Potter, potion-making is basically magical chemistry—and it's not far from reality! Medieval alchemists mixed potions that were genuinely medicinal (some contained actual useful compounds), but also marketed potions that were total fraud—the original 'snake oil salesmen'.
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