/ Dictionary / Index U ultrashort: Meaning and Definition of Find definitions for: ul•tra•short Pronunciation: (ul"tru-shôrt'), [key] — adj. extremely short. (of a wavelength) smaller than 10 meters. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ultrarightist ultrasonic Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language