[v. en-vel-uhp; n. en-vel-uhp, en-vuh-luhp, ahn-]
verb (used with object), enveloped, enveloping.
to wrap up in or as in a covering: The long cloak she was wearing enveloped her completely.
to serve as a wrapping or covering for, as a membrane of an organ or a sheath.
to surround entirely.
Military. to attack (an enemy's flank).

1350–1400; Middle English envolupen < Old French envoluper, equivalent to en- en-1 + voloper to envelop, of obscure origin; compare Old Provençal (en)volopar, Italian inviluppare to envelop, Italian viluppo tuft, bundle, confusion, referred to Medieval Latin faluppa chaff, wisp of straw, perhaps influenced by the descendants of Latin volvere to roll

enveloper, noun
preenvelop, verb (used with object)
unenveloped, adjective

envelop, envelope.

1. enfold, cover, hide, conceal. 3. encompass, enclose.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
envelop (ɪnˈvɛləp)
vb , -lops, -loping, -loped
1.  to wrap or enclose in or as if in a covering
2.  to conceal or obscure, as from sight or understanding: a plan enveloped in mystery
3.  to surround or partially surround (an enemy force)
[C14: from Old French envoluper, from en-1 + voluper, voloper, of obscure origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., "be involved in," from O.Fr. envoluper, from en- "in" + voloper "wrap up," of uncertain origin, perhaps Celtic.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In fact, you'll wonder if you didn't get the thick envelop by mistake.
Sundews envelop their victims in an embrace of sticky tentacles.
Such a slab can envelop entire slopes as it hurtles downward, crushing all that
  lies in its path.
In fact depending on how thick the envelop it could silence the noise as well.
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