a wheel with a rim notched into teeth, which mesh with those of another wheel or of a rack to transmit or receive motion
- A toothed wheel.
- One of a set of cogged wheels within a mechanism.
- A gear wheel
- (When used attributively) Something behaving in similar, jerky, manner as a cogwheel, e.g. cogwheel respiration as a side effect of hyperbaric medicine
- The man who does not understand the construction of the machine cannot conceive that the small connecting cogwheel which revolves quietly is one of the most essential parts of the machine, and not the shaving which merely harms and hinders the working.
- The handle D, acting through the gear wheels E, F, G and H, turns the cogwheel K, which moves the curved rack of the cradle and tips the crucible M.