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1. Enclosed within a hard shell, usually the skin of the last larval instar. Used of an insect pupa.
2. Constricted, narrowed, or compressed, as a segment of a blood vessel.
1. (Zoology) (of a pupa) enclosed in a hard barrel-shaped case (puparium), as in the housefly
2. (Biology) crowded or pressed together; constricted
(Pathology) pathol (esp of the aorta) to become narrower; become constricted
[C15: from Latin coarctāre, to press together, from artus tight]
Past participle: coarctated