ENVELOPE

(noun) any wrapper or covering
(noun) a flat (usually rectangular) container for a letter, thin package, etc.
(noun) the bag containing the gas in a balloon
synonyms : gasbag
(noun) the maximum operating capability of a system (especially an aircraft)
"test pilots try to push the envelope"
(noun) a natural covering (as by a fluid)
"the spacecraft detected an envelope of gas around the comet"
(noun) a curve that is tangent to each of a family of curves

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