op'tical sound'track

the final soundtrack on a motion picture, which appears as a band of black and white serrations along a strip of film to the left of the composite print. Light is shined through the serrations and is converted to audible sound. Also called op'tical track'.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

optical soundoptical tooling

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