refine
vb
1 to make or become free from impurities, sediment, or other foreign matter; purify
2 tr to separate (a mixture) into pure constituents, as in an oil refinery
3 to make or become free from coarse characteristics; make or become elegant or polished
4 tr; often foll by: out to remove (something impure or extraneous)
5 intr; often foll by: on or upon to enlarge or improve (upon) by making subtle or fine distinctions
6 tr to make (language) more subtle or polished
(C16: from re- + fine1)
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refinable adj
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refiner n