Jacket

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Jacket

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1. A covering or casing of some kind. </dd>
2. Specifically, a shell around the combustion chamber of a liquid-fuel rocket, through which the propellant is circulated in regenerative cooling. </dd>
3. A coating of one material over another to prevent oxidation, micrometeoroid penetration, etc. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use