/ Dictionary / Index A acouasm: Meaning and Definition of Find definitions for: a•cou•asm Pronunciation: (u-k'az-um, ak'-az"-), [key] — n. Psychiatry. a nonverbal auditory hallucination, as a ringing or hissing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acotyledon acousma Related Content Daily Word Quiz: cosmology Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language