/ Dictionary / Index U ultrasonic: Meaning and Definition of Find definitions for: ul•tra•son•ic Pronunciation: (ul"tru-son'ik), [key] — adj. of, pertaining to, or utilizing ultrasound. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ultrasonic (Thesaurus) ultrashort ultrasonics Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language