Breadcrumb Home > Dictionary > Index S sound head: Meaning and Definition of Find definitions for: sound' head" Pronunciation: [key] — Motion Pictures. Motion Pictures. a mechanism through which film passes in a projector for conversion of the soundtrack into audio-frequency signals that can be amplified and reproduced. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sound film sound hole TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: inimical Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language