cam
UK[kæm]US[kæm]
n
A projection on a rotating part in machinery, designed to convert circular motion into linear motion or to change the timing of valve operation in an engine.
Etymology
The word 'cam' entered English in the late 18th century as a mechanical engineering term. It is a clipped form of 'camshaft' or directly borrowed from Dutch 'kam', meaning 'cog' or 'comb', reflecting the tooth-like projections of early cams. This Dutch term is related to the German 'Kamm' (comb), tracing back to a common Germanic root. The semantic evolution from 'comb' to a mechanical 'projection' is a clear metaphorical shift based on shared visual and functional characteristics of interlocking teeth and lobes.
Analysis
The word 'cam' is a simplex word. It is a shortening of 'camshaft' or from the earlier Dutch technical term 'kam', meaning 'cog' or 'comb', which itself is of Germanic origin.
Examples
The engine's performance depends on the precise design of the cam and its lobes.
As the cam rotates, it pushes against a follower to create a specific motion.
Variable valve timing systems use advanced cam profiles to improve efficiency.