the part of a film projector that reproduces the sound in a film
sound head in American English
noun
Films
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: sound gate
Word origin
[1930–35]This word is first recorded in the period 1930–35. Other words that entered Englishat around the same time include: boondoggle, kickback, old school tie, preset, saddle stitch