A protective cover or cap that fits over a mechanical drive or driving mechanism.
Compound of 'drive' (Old English 'drifan') and 'cap' (from Latin 'cappa', a head covering). Created to name the practical protective component used in machinery.
Even tiny parts get their own names in engineering—'drivecap' shows how industries develop specialized vocabulary to describe components that protect the moving parts that actually do the work in machines.
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