ultracentrifuge Syllabification: (ul·tra·cen·tri·fuge)Pronunciation: /ˌəltrəˈsentrəˌfyo͞oj/Definition of ultracentrifuge noun a very fast centrifuge used to precipitate large biological molecules from solution or separate them by their different rates of sedimentation. verb [with object] subject to the action of an ultracentrifuge. Derivatives ultracentrifugal adjective ultracentrifugationPronunciation: /-ˌsentrəfyo͝oˈgāSHən, -senˌtrif(y)ə-/ noun ultracentrifuge in other Oxford dictionaries Definition of ultracentrifuge in the British & World English dictionary