Source : Webster's Revised Unabridged Dictionary (1913)

Envelop \En*vel"op\, v. t. [imp. & p. p. {Enveloped}; p. pr. &
   vb. n. {Enveloping}.] [OE. envolupen, envolipen, OF.
   envoluper, envoleper, F. envelopper; pref. en- (L. in) +
   voluper, voleper. See {Develop}.]
   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.

         Nocturnal shades this world envelop.     --J. Philips.

Source : WordNet®

enveloped
     adj : completely enclosed or swallowed up; "a house engulfed in
           flames"; "the fog-enveloped cliffs"; "a view swallowed
           by night" [syn: {engulfed}, {swallowed}]