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Definition of Fluidized bed
1. Noun. An industrial unit process in which a quantity of a solid particulate substance is caused to float in a stream of a fluid (usually air or other gas) in order to create conditions in which many chemical, combustion and drying reactions take place efficiently. ¹
2. Noun. A reactor vessel or other piece of equipment in which a substance is maintained in the fluidized state. In this context, often used attributively. ¹
¹ Source: wiktionary.com