/ Dictionary / Index U ultramicrobalance: Meaning and Definition of Find definitions for: ul•tra•mi•cro•bal•ance Pronunciation: (ul"tru-mī'kru-bal"uns), [key] — n. Chem. a balance for weighing precisely, to a hundredth of a microgram or less, minute quantities of material. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ultrametamorphism ultramicrochemistry Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language