Jacket is the outermost layer of a cable.

Webster Dictionary Meaning

1. Jacket
- A short upper garment, extending downward to the hips; a short coat without skirts.
- An outer covering for anything, esp. a covering of some nonconducting material such as wood or felt, used to prevent radiation of heat, as from a steam boiler, cylinder, pipe, etc.
- In ordnance, a strengthening band surrounding and reenforcing the tube in which the charge is fired.
- A garment resembling a waistcoat lined with cork, to serve as a life preserver; -- called also cork jacket.
2. Jacket
- To put a jacket on; to furnish, as a boiler, with a jacket.
- To thrash; to beat.
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