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n. gasbag

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1. Can I use this envelope?
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2. Please write down your name on this envelope.
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3. Can I have an envelope? I want to write to my friend.
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n.
  1. a flat rectangular paper container for papers
  2. any wrapper or covering
  3. a curve that is tangent to each of a family of curves
  4. a natural covering (as by a fluid)
  5. the maximum operating capability of a system
  6. the bag containing the gas in a balloon

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envelope
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convective envelope
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Commemorative Envelope
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envelope machine
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envelope conformation
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