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[Subject: Chemistry]
- The process of removing impurities (as from oil or metals or sugar etc.)
Translated in 59 languages
[Subject: Metallurgy]
Translated in 11 languages
[Subject: Industrial Chemicals]
Translated by: SYLVIA VERGARA
Translated in 2 languages
[Subject: Generalities]
- To make pure or improve
Translated by: FARHAD PEZESHKI
Translated in 30 languages