The protective metal housing or casing that contains gears and keeps them lubricated with oil.
Compound of 'gear' and 'case' (a container or covering). Developed as industrial machinery became more complex in the 19th century, requiring protective enclosures.
A gearcase is like a suit of armor for your gears—it protects metal teeth from damage while trapping oil inside so everything moves smoothly without overheating.
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