1. (noun) thin wheel with teeth that engage with a chain

• sprocket wheel

2. (noun) tooth on the rim of gear wheel

• cog

1. (noun) roller that has teeth on the rims to pull film or paper through

• roller

2. (noun) thin wheel with teeth that engage with a chain

• wheel

3. (noun) tooth on the rim of gear wheel

• tooth

1. (noun) tooth on the rim of gear wheel

• cog