/ Dictionary / Index U ultramicrofiche: Meaning and Definition of Find definitions for: ul•tra•mi•cro•fiche Pronunciation: (ul"tru-mī'kru-fēsh"), [key] — n. ultrafiche. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ultramicrochemistry ultramicrometer Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language