9 letters · 13 points in Scrabble
adjective (of an insect pupa) enclosed in a rigid case
originBorrowed from Latin coarctātus, perfect participle of coarctō (“to press together, compress, contract, confine”), from co- (“being or bringing together, co-”) + arctō (“to draw or press close together”).
Etymology from Wiktionary, CC BY-SA 3.0