(ĕn-vī'rən, -vī'ərn) tr.v., -roned, -ron·ing, -rons. To encircle; surround. See synonyms at surround.
[Middle English envirounen, from Old French environner, from environ, round about : en-, in; see en-1 + viron, circle (from virer, to turn; see veer1).]