British spelling variant of cupeler; a craftsperson specializing in cupellation and the refinement of precious metals.
British English formation of the agent noun from 'cupel' with double '-l' before '-er,' following British conventions for consonant doubling.
The double 'l' in 'cupeller' versus single 'l' in 'cupeler' shows how spelling rules create international variants—same profession, different sides of the Atlantic, a reminder that English is a plural language with multiple valid standards.
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