A curve or surface which is tangent to each member of a system of curves or surfaces, the form and position of the members of the system being allowed to vary according to some continuous law
enclose or enfold completely with or as if with a covering; "Fog enveloped the house
enclose or enfold completely with or as if with a covering; "Fog enveloped the house"
To put a covering about; to wrap up or in; to inclose within a case, wrapper, integument or the like; to surround entirely; as, to envelop goods or a letter; the fog envelops a ship
If one thing envelops another, it covers or surrounds it completely. That lovely, rich fragrant smell of the forest enveloped us an enveloping sense of well-being. to cover or wrap something or someone up completely envelop in (envoloper, from voloper )