coarctation

adjective

1. compressed or constricted
2. rigidly enclosed in the last larval skin: said of certain insect pupae

Etymology: < L coarctatus, pp. of coarctare, to press together < co-, together + artare, to press together < artus, fitted, narrow < artus, a joint (see art): sp. infl. by assoc. with arcere, to enclose