/ Dictionary / Index U ultraminiature: Meaning and Definition of Find definitions for: ul•tra•min•i•a•ture Pronunciation: (ul"tru-min'ē-u-chur, -choor", -min'u-chur), [key] — adj. subminiature. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ultramicrotome ultraminiaturize Related Content Daily Word Quiz: inane Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language