Breadcrumb Home > Dictionary > Index A acoustical cloud: Meaning and Definition of Find definitions for: acous'tical cloud' Pronunciation: [key] one of a number of acoustic panels installed near the ceiling of a concert hall to reflect sound for improving the acoustic quality of music. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acoustic acoustical surveillance ✖ Related Content Daily Word Quiz: derogate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language