ENVELOPE
- a paper container [n ENVELOPES]
- a flat usually paper container (as for a letter)
- natural enclosing covering (as a membrane, shell, or integument)
- lipoprotein unit membrane that forms the outer layer of some virions
- curve tangent to each of a family of curves
- surface tangent to each of a family of surfaces
- set of performance limits (as of an aircraft) that may not be safely exceeded
- conventionally accepted limit new computers that push the envelope
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