circumvallation

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cir·cum·val·late

 (sûr′kəm-văl′āt′)
tr.v. cir·cum·val·lat·ed, cir·cum·val·lat·ing, cir·cum·val·lates
To surround with or as if with a rampart.
adj.
1. (also -ĭt) Surrounded with or as if with a rampart.
2. Anatomy Surrounded by a ridge or raised, wall-like structure.

[Latin circumvallāre, circumvallāt- : circum-, circum- + vallum, rampart with palisades (from vallus, post, stake).]

cir′cum·val·la′tion n.