A person who performs cupping, an old medical treatment where cups are applied to the skin to draw out illness; also someone who cups or shapes things into cups.
From cup plus the agent noun suffix '-er'. Medical cupping dates back to ancient Egypt and China, so 'cupper' would have referred to practitioners of this technique for centuries.
Cupping therapy is experiencing a comeback in modern sports and wellness, but cupping doctors were serious medical professionals in medieval Europe—it was considered sophisticated medicine and mentioned in medical texts for treating everything from migraines to chest pain.
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