circumvallates >> /ˌsəːkəmˈvaleɪt/
Definition: [verb] Surround with or as if with a rampart.
Example: the walls were circumvallated with a ditch
Definition: [adjective] Surrounded or surrounding as if by a rampart.
Example: circumvallate mountains
Definition: [adjective] Denoting certain papillae near the back of the tongue, surrounded by taste receptors.
Example: Eight to 12 larger mushroom shaped (circumvallate) papillae, each surrounded by a circular trough, lie at the back of the tongue in a V-shaped formation; these have on average 250 taste buds each.