[en.vi.ron] vt [ME envirounen, fr. MF environner, fr. environ around, fr. en in (fr. L in) + viron circle, fr. virer to turn--more at veer] (14c): encircle, surround
ENVIRON
Meaning of ENVIRON in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012