noun, plural re·fin·er·ies.

  1. an establishment for refining something, as metal, sugar, or petroleum.

noun plural -eries

  1. a factory for the purification of some crude material, such as ore, sugar, oil, etc

1727, from refine + -ery. Originally in metallurgy and sugar-making; of petroleum by 1865.

  1. An industrial plant that uses mechanical and chemical means to purify a substance, such as petroleum or sugar, or to convert it to a form that is more useful.

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