refiner

One who refines liquors, sugar, metals, etc.

An improver in purity and elegance.

An inventor of superfluous subtleties; one who is overnice in discrimination, or in argument, reasoning, philosophy, etc.

One who indulges in excessive compliment; one who is over-civil; a flatterer.

An apparatus for refining; specifically, in England, a gas-purifier.

One who, or that which, refines.

Agent noun of refine; one who refines.

one whose work is to refine a specific thing