\Cir`cum*val"late\, v. t. [L. circumvallatus, p.
p. of circumvallare to surround with a wall; circum + vallare
to wall, fr. vallum rampart.]
To surround with a rampart or wall. --Johnson.

\Cir`cum*val"late\, a.
1. Surrounded with a wall; inclosed with a rampart.

2. (Anat.) Surrounded by a ridge or elevation; as, the
   circumvallate papill[ae], near the base of the tongue.