/ Dictionary / Index A asdic: Meaning and Definition of Find definitions for: asdic Pronunciation: (az'dik), [key] — n. Brit. sonar. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: asdic (Thesaurus) ascus ASE Related Content Daily Word Quiz: alacrity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language