Definition of: circumvallate

(sûr′kəm·val′āt) v.t. ·lat·ed, ·lat·ing
To surround with a rampart or a trench.
—adjective Enclosed by or as by a wall or rampart: circumvallate papillae. [<L circumvallatus, pp. of circumvallare <circum- around + vallare fortify <vallum rampart]
—cir′cum·val·la′tion noun