sprocket hole

American  

noun

1. any of a series of regular perforations along the edge of photographic film for engaging the drive sprockets in a motion-picture camera or projector.

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Etymology

Origin of sprocket hole

First recorded in 1905–10

Example Sentences

This documentary, directed by Amy Scott, is assembled in the semi-standard slick method of our day — you know, where they make the vintage footage look really vintage by digitally inserting a sprocket hole on the left side of the frame.

From New York Times