Webster's English Dictionary

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envelop

en.vel.op \in-'vel-*p\ \-m*nt\ vt [ME envolupen, fr. MF envoluper, 
   enveloper, fr. OF envolop]er, fr. en- + voloper to wrap 1: to enclose or 
   enfold completely with or as if with a covering  2: to mount an attack on 
   (an enemy's flank)  - en.vel.op.ment n