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]

The Collaborative International Dictionary of English v.0.48:

Coarctate \Co*arc"tate\, a. [L. coarctatus, p. p. of coarctare
   to press together; co- + arctare to press together, from
   arctus, p. p. See Arctation.] (Zool.)
   Pressed together; closely connected; -- applied to insects
   having the abdomen separated from the thorax only by a
   constriction.
   [1913 Webster]

   Coarctate pupa (Zool.), a pupa closely covered by the old
      larval skin, as in most Diptera.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coarct \Co*arct"\, Coarctate \Co*arc"tate\, v. t. [See
   Coarctate, a.]
   1. To press together; to crowd; to straiten; to confine
      closely. [Obs.] --Bacon.
      [1913 Webster]

   2. To restrain; to confine. [Obs.] --Ayliffe.
      [1913 Webster]

WordNet (r) 3.0 (2006):

coarctate
    adj 1: (of an insect pupa) enclosed in a rigid case