a flat paper container, as for a letter or thin package, usually having a gummed flap or other means of closure.
something that envelops; a wrapper, integument, or surrounding cover.
Biology . a surrounding or enclosing structure, as a corolla or an outer membrane.
Geometry . a curve or surface tangent to each member of a set of curves or surfaces.
Radio . (of a modulated carrier wave) a curve connecting the peaks of a graph of the instantaneous value of the electric or magnetic component of the carrier wave as a function of time.
the fabric structure enclosing the gasbag of an aerostat.
the gasbag itself.
Electronics . the airtight glass or metal housing of a vacuum tube.
the technical limits within which an aircraft or electronic system may be safely operated. ?
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