/ Dictionary / Index U ultracentrifuge: Meaning and Definition of Find definitions for: ul•tra•cen•tri•fuge Pronunciation: (ul"tru-sen'tru-fyj"), [key] — n., v., -fuged, -fug•ing. —n. a high-speed centrifuge for subjecting sols or solutions to forces many times that of gravity and producing concentration differences depending on the weight of the micelle or molecule. —v.t. to subject to the action of an ultracentrifuge. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ultracentrifuge (Thesaurus) ultrabasic ultraclean Related Content Daily Word Quiz: benevolent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language