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.
Dwelling in a pleasant glade,
With mountains round about environed. --Spenser.
Environed he was with many foes. --Shak.
Environ me with darkness whilst I write. --Donne.