The Collaborative International Dictionary of English v.0.48:

enclosed \enclosed\ adj.
   surrounded or closed in, usually on all sides. Opposite of
   unenclosed. [Narrower terms: basined; capsulate,
   capsulated; closed, closed in(predicate); coarctate;
   confined, fenced in, penned; embedded, fixed; embedded,
   surrounded; encircled; enveloped; fogbound;
   self-enclosed; surrounded, encircled]
   [WordNet 1.5]