\Co*arc"tate\, a. [L. coarctatus, p. p. of coarctare
to press together; co- + arctare to press together, from
arctus, p. p. See {Arctation}.] (Zo["o]l.)
Pressed together; closely connected; -- applied to insects
having the abdomen separated from the thorax only by a
constriction.
{Coarctate pupa} (Zo["o]l.), a pupa closely covered by the
   old larval skin, as in most Diptera.