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Envelope

[n] any wrapper or covering
[n] a flat rectangular paper container for papers
[n] the bag containing the gas in a balloon
[n] the maximum operating capability of a system; "test pilots try to push the envelope"
[n] a natural covering (as by a fluid); "the spacecraft detected an envelope of gas around the comet"
[n] a curve that is tangent to each of a family of curves


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Synonyms

gasbag