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1. a relatively thin wheel having teeth projecting radially from the rim, esp one that drives or is driven by a chain
2. an individual tooth on such a wheel
3. a cylindrical wheel with teeth on one or both rims for pulling film through a camera or projector
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
A tooth on the periphery of a wheel or cylinder to engage in the links of a chain, the perforations of a motion picture film, or other similar device.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
sprocket, cocking piece, sprocket piece
In roofing, a strip of wood, fixed to the upper side of rafters at the eaves; raises the edge of the eaves and forms a break in the roof line.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.