The Collaborative International Dictionary of English v.0.48:

Environ \En*vi"ron\, v. t. [imp. & p. p. Environed; p. pr. &
   vb. n. Environing.] [F. environner, fr. environ about,
   thereabout; pref. en- (L. in) + OF. viron circle, circuit,
   fr. OF. & F. virer to turn, LL. virare to turn up and down,
   topsy-turvy. Cf. Veer.]
   To surround; to encompass; to encircle; to hem in; to be
   round about; to involve or envelop.
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         Dwelling in a pleasant glade,
         With mountains round about environed.    --Spenser.
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         Environed he was with many foes.         --Shak.
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         Environ me with darkness whilst I write. --Donne.
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The Collaborative International Dictionary of English v.0.48:

Environ \En*vi"ron\, adv. [F.]
   About; around. [Obs.]
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         Lord Godfrey's eye three times environ goes. --Fairfax.
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WordNet (r) 3.0 (2006):

environ
    v 1: extend on all sides of simultaneously; encircle; "The
         forest surrounds my property" [syn: surround, environ,
         ring, skirt, border]