Jisho

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Noun, Suru verb, No-adjective
1. refining; purification
Wikipedia definition
2. RefiningRefining (also called affining) is the process of purification of a (1) substance or a (2) form. The term is usually used of a natural resource that is almost in a usable form, but which is more useful in its pure form. For instance, most types of natural petroleum will burn straight from the ground, but it will burn poorly and quickly clog an engine with residues and by-products.
Read “Refining” on English Wikipedia
Read “精製” on Japanese Wikipedia
Read “Refining” on DBpedia

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