The process of subjecting to an ultracentrifuge.
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ul·tra·cen·tri·fu·ga·tion -.sen-trə-fyu̇-'gā-shən n the process of using an ultracentrifuge
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ul·tra·cen·trif·u·ga·tion (ul″trə-sən-trif″u-gaґshən) subjection to the action of an ultracentrifuge.Medical dictionary. 2011.