Main Entry: en·vi·ron

Pronunciation: \in-ˈvī-rən, -ˈvī(-ə)rn\

Function: transitive verb

Etymology: Middle English envirounen, from Anglo-French enviruner, from envirun around, from en in (from Latin in) + virun circle, from virer to turn — more at veer

Date: 14th century

: encircle, surround