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nounthe bag containing the gas in a balloon
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nouna curve that is tangent to each of a family of curvestype of:
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nouna flat (usually rectangular) container for a letter, thin package, etc.type of:
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"the spacecraft detected an envelope of gas around the comet"nouna natural covering (as by a fluid)type of:
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nounany wrapper or covering
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"test pilots try to push the envelope"nounthe maximum operating capability of a system (especially an aircraft)
Words sounding like good envelope