envelope

Noun
  1. A flat (usually rectangular) container for a letter, thin package, etc. (synset 103296730)
    is a type of: container - any object that can be used to hold things (especially a large metal boxlike object of standardized dimensions that can be loaded from one form of transport to another)
    subtypes: window envelope - an envelope with a transparent panel that reveals the address on the enclosure
  2. Any wrapper or covering (synset 103296652)
    is a type of: wrap, wrapper, wrapping - the covering (usually paper or cellophane) in which something is wrapped
  3. A curve that is tangent to each of a family of curves (synset 113892427)
    is a type of: curve, curved shape - the trace of a point whose direction of motion changes
  4. A natural covering (as by a fluid) (synset 109296682)
    "the spacecraft detected an envelope of gas around the comet"
    is a type of: cover, covering, natural covering - a natural object that covers or envelops
  5. The maximum operating capability of a system (especially an aircraft) (synset 105211741)
    "test pilots try to push the envelope"
    is a type of: operating capability, performance capability - the capability of a technological system to perform as intended
  6. The bag containing the gas in a balloon (synset 103296874)
    is a type of: bag - a flexible container with a single opening
    is a part of: balloon - large tough nonrigid bag filled with gas or heated air
    same as: gasbag

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