encasement

something that encloses another thing especially to protect it an encasement of several inches of silt had helped to preserve the sunken remains of the historic ship Synonyms armor, capsule, casing, cocoon, cover, covering, case, housing, hull, husk, jacket, pod, sheath, shellRelated Words cartridge, cassette (also casette); bark, crust; carapace, house, mail, panoply, plate, plating, shield; cuticle, hide, skin; envelope, package, wrapper; backing, coating, coverture, facing