sprocket

[ sprok-it ]

/ ˈsprɒk ɪt /

Machinery.

Also called chainwheel, sprocket wheel. a toothed wheel engaging with a conveyor or power chain.
one tooth of such a wheel.

Carpentry. a wedge-shaped piece of wood extending a sloping roof over the eaves with a flatter pitch.

Origin of sprocket

First recorded in 1530–40; origin uncertain

spritsail, spritz, spritzer, spritzig, sproat, sprocket, sprocket hole, sprog, sprout, spruance, spruce

The sprocket holes must match accurately and the films must line up straight.

Motion Picture Operation, Stage Electrics and Illusions |Henry C. Horstmann
The parts to be turned are sprocket wheels which are held in the two 9-inch chucks.

Turning and Boring |Franklin D. Jones
The film contains sixteen pictures to each foot and for every picture there are four sprocket holes on each side of the film.

Motion Picture Operation, Stage Electrics and Illusions |Henry C. Horstmann
It was not until then that he saw that the chain and sprocket, which made the crossing easy, were missing.

The Man from the Bitter Roots |Caroline Lockhart

Here again one must be careful to see that the insertion is square and that the sprocket teeth mesh with the film perforations.

Practical Cinematography and Its Applications |Frederick Arthur Ambrose Talbot

sprocket

/ (ˈsprɒkɪt) /

Also called: sprocket wheel a relatively thin wheel having teeth projecting radially from the rim, esp one that drives or is driven by a chain

an individual tooth on such a wheel

a cylindrical wheel with teeth on one or both rims for pulling film through a camera or projector

a small wedge-shaped piece of wood used to extend a roof over the eaves

C16: of unknown origin