envelop

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en·vel·op / enˈveləp/ • v. (-vel·oped, -vel·op·ing) [tr.] wrap up, cover, or surround completely: a figure enveloped in a black cloak. ∎  make obscure; conceal. ∎  (of troops) surround (an enemy force).DERIVATIVES: en·vel·op·ment n.

envelop

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envelop XIV. ME. envolupe — OF. envoluper, -oper (mod. envelopper), f. EN-1 + *volup-, *velup-, of unkn. orig.; cf. DEVELOP.
So envelope XVIII.