/ Dictionary / Index A astrionics: Meaning and Definition of Find definitions for: as•tri•on•ics Pronunciation: (as"trē-on'iks), [key] — n. (used with a sing. v.) Rocketry. the science dealing with the application of electronics to astronautics. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. astringer astro- Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language